The infant's weight is 7 pounds and 10 ounces using weight conversion.
To convert the weight of the newborn from grams to pounds, we need to divide the weight by the number of grams in one pound, which is 453.59. So, 3,459 grams divided by 453.59 grams per pound is equal to 7.628 pounds.
To find the weight in ounces, we need to multiply the decimal part of the pounds by 16 (since there are 16 ounces in one pound). So, 0.628 x 16 = 10.048 ounces.
Therefore, the infant's weight is 7 pounds and 10 ounces.
It is important to note that weight conversion is often used in the medical field to monitor the health and growth of newborns. By tracking their weight in pounds and ounces, doctors can ensure that they are gaining weight at a healthy rate and are meeting their developmental milestones.
This information can also be used to make adjustments to their feeding or treatment plans if necessary. It is crucial for healthcare professionals to accurately convert weight measurements to ensure the best possible care for their patients.
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A fair coin is tossed 10 times, given that there were 4 heads in the 10 tosses, what is the probability that the first toss was head
What is the probability that the number of times Luke will hit the inner ring of the target out of the 5 attempts is less than the mean of X ?
The probability that Luke will hit the inner ring fewer than 3 times is 0.069.
How to calculate the probability the number of times Luke will hit the inner ring of the target out?To calculate the probability that the number of times Luke will hit the inner ring of the target out of the 5 attempts is less than the mean of X, we need to know the distribution of X.
Assuming that each shot is independent and has the same probability p of hitting the inner ring, X follows a binomial distribution with parameters n=5 and p.
The mean of a binomial distribution is given by μ = np, so in this case, the mean of X is 5p.
To find the probability that X is less than 5p, we can use the cumulative distribution function (CDF) of the binomial distribution. Let F(k) denote the CDF of the binomial distribution with parameters n=5 and p, evaluated at k.
Then the probability that X is less than 5p is:
P(X < 5p) = F(4p)
Note that we use 4p instead of 5p in the argument of F, since we want the probability that X is strictly less than 5p, not less than or equal to 5p.
Using a binomial table or calculator, we can look up or compute the value of F(4p) for a given value of p.
For example, if p=0.6 (which corresponds to Luke hitting the inner ring 60% of the time), we get:
P(X < 5p) = F(2.4) ≈ 0.069
So the probability that Luke will hit the inner ring fewer than 3 times (which is less than 5p=3) out of the 5 attempts is about 0.069, assuming he hits the inner ring with a probability of 0.6 on each shot.
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Suppose the population standard deviation of X is 4 and the population standard deviation of Y is 2. Answer the following two questions, rounding to the nearest whole number (and remembering that variance is the square of standard deviation). What is Var[7X - 5Y] if the covariance of X and Y is 2
To find the variance of 7X - 5Y, we need to first find the variance of 7X and 5Y separately, and then subtract twice the covariance of X and Y (since we are given the covariance, not the correlation coefficient). The variance of 7X - 5Y is 1024.
Var[7X] = 49Var[X] = 49(16) = 784
Var[5Y] = 25Var[Y] = 25(4) = 100
Cov[X,Y] = 2
Now, using the formula for variance of a linear combination of two random variables:
Var[7X - 5Y] = Var[7X] + Var[5Y] - 2Cov[X,Y]
= 784 + 100 - 2(2)
= 880
Therefore, the variance of 7X - 5Y is approximately 880 (rounded to the nearest whole number).
Suppose the population standard deviation of X is 4 and the population standard deviation of Y is 2, and the covariance of X and Y is 2. To find the variance of 7X - 5Y, we use the formula Var[aX ± bY] = a²Var[X] + b²Var[Y] ± 2abCov[X,Y]. In this case, a = 7, b = -5, Var[X] = 4², Var[Y] = 2², and Cov[X,Y] = 2.
Var[7X - 5Y] = 7²(4²) + (-5)²(2²) - 2(7)(-5)(2)
Var[7X - 5Y] = 49(16) + 25(4) + 140
Var[7X - 5Y] = 784 + 100 + 140
Var[7X - 5Y] = 1024
So the variance of 7X - 5Y is 1024.
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the volume of a box is 96 cubic inches. the length is 8 inches more than the height. the width is 2 inches less than the height. find the dimensions of the box
The dimensions of the box are 12 inches by 2 inches by 4 inches.
Let's use variables to represent the dimensions of the box:
Let h be the height of the box (in inches).
Then, the length of the box is 8 inches more than the height, so it is h + 8.
The width of the box is 2 inches less than the height, so it is h - 2.
The volume of the box is given as 96 cubic inches, so we can set up an equation:
Volume = Length × Width × Height
96 = (h + 8) × (h - 2) × h
h = 4
Height: h = 4 inches
Length: h + 8 = 12 inches
Width: h - 2 = 2 inches
Therefore, the dimensions of the box are 12 inches by 2 inches by 4 inches.
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The average score in the NFL is normally distributed. The average score is 43.06 points, with a standard deviation of 15 points. What is the probability that the average of 16 selected games scored larger than 38 points
To solve this problem, we need to use the formula for the z-score:z = (x - μ) / (σ / sqrt(n)), where x is the sample mean (which is the average score in 16 selected games), μ is the population mean (which is 43.06 points), σ is the population standard deviation (which is 15 points), and n is the sample size (which is 16).
Given the average score in the NFL is 43.06 points with a standard deviation of 15 points. Since we are looking at the average of 16 selected games, we need to calculate the standard error, which is the standard deviation divided by the square root of the sample size (in this case, 16):
Standard error = 15 / √16 = 15 / 4 = 3.75
Now, we will calculate the z-score for 38 points, which represents how many standard errors 38 points is away from the average score:
Z-score = (38 - 43.06) / 3.75 = -1.35
Using a z-score table or calculator, we find the probability of a z-score being less than -1.35 is approximately 0.0885 or 8.85%.
Since we want the probability that the average of 16 selected games scored larger than 38 points, we need to find the complement of this probability:
Probability (average score > 38) = 1 - 0.0885 = 0.9115 or 91.15%
So, the probability that the average of 16 selected games scored larger than 38 points is approximately 91.15%.
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A ball is dropped from a treetop 256 feet above the ground. How long does it take to hit the ground? Use the formula s =16t2, where s is the distance in feet, 16 is half the gravitational acceleration and t is the time.4 seconds16 seconds8 seconds
It takes 4 seconds for the ball to hit the ground.
How to find the time it take to hit the ground?The formula for the distance fallen by an object keeping in mind the motion of object dropped from rest is:
[tex]s = 1/2gt^2[/tex]
where s is the distance fallen, g is the acceleration due to gravity [tex](32 ft/s^2)[/tex], and t is the time taken to fall.
In this problem, the initial height of the ball is 256 feet, so the distance fallen is:
s = 256 - 0 = 256 feet
Substituting into the formula, we get:
[tex]256 = 1/2 * 32 * t^2[/tex]
Simplifying, we get:
[tex]256 = 16t^2[/tex]
Dividing both sides by 16, we get:
[tex]t^2 = 16[/tex]
Taking the square root of both sides, we get:
t = 4 seconds or -4 seconds
We can ignore the negative solution, so the answer is:
t = 4 seconds
Therefore, it takes 4 seconds for the ball to hit the ground.
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If you have a sample size of 16 and a population standard deviation of 40, what is your standard error of the mean
The standard error of the mean is 10.
The standard error of the mean (SEM) is calculated by dividing the
population standard deviation (σ) by the square root of the sample size (n):
SEM = σ / √n
In this case, the population standard deviation is 40 and the sample size is 16.
Substituting these values into the formula, we get:
SEM = 40 / √16
SEM = 40 / 4
SEM = 10
Therefore, the standard error of the mean is 10.
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Which item does the author use to describe the appearance of the two Things?
A
a horse's head
B
a fisherman's basket
C
a thin hail
D
a gap in the lightning
n a large population, 63 % of the people have been vaccinated. If 3 people are randomly selected, what is the probability that AT LEAST ONE of them has been vaccinated
Answer:
The probability that a person has not been vaccinated is 37%.
[tex]1 - {.37}^{3} = .949347 = 94.9347\%[/tex]
A complete collection of all elements (scores, people, measurements, and so on) to be studied is called the Group of answer choices sample population parameter grade
The correct option is B. The complete collection of all elements, individuals, measurements, scores, or other entities that are of interest and relevant to a particular study or analysis is called the population.
A collection is a group of items that have been gathered or accumulated together based on a particular theme or purpose. Collections can be made up of physical objects such as books, stamps, coins, or artwork, as well as digital items like photos, music, or videos. Collections can also refer to data structures in computer programming that hold groups of related items.
People often collect items as a hobby or passion, and the act of collecting can bring a sense of fulfillment, enjoyment, and satisfaction. Collections can have both sentimental and monetary value, and they may be displayed in personal or public settings, such as museums or galleries. The process of collecting often involves researching and acquiring new items, as well as organizing and preserving the existing collection.
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An equiangular hexagon has side lengths of 6, 8, 12, 6, 8, and 12 in that order. What is the area of this hexagon
The area of this equiangular hexagon is 104sqrt(3).
An equiangular hexagon has six equal angles, so each angle measures 120 degrees. We can divide this hexagon into six equilateral triangles with side lengths of 6, 8, and 12.
To find the area of each equilateral triangle, we can use the formula
[tex]A = (\sqrt{(3)/4} ) \times s^2[/tex], where s is the length of a side.
For the triangle with side length 6, its area is
[tex]A1 = (\sqrt{(3)/4} ) \times 6^2[/tex] = [tex]9\sqrt{3}[/tex]
For the triangle with side length 8, its area is
[tex]A2 = (\sqrt{(3)/4} ) \times 8^2 = 16\sqrt{3}[/tex]
For the triangle with side length 12, its area is
[tex]A3 = (\sqrt{(3)/4} ) \times 12^2 = 27\sqrt{3}[/tex]
The area of the hexagon is simply the sum of the areas of these six equilateral triangles, which is:
A = A1 + A2 + A3 + A1 + A2 + A3
= 2A1 + 2A2 + 2A3
[tex]= 2(9\sqrt{3} ) + 2(16\sqrt{3} ) + 2(27\sqrt{3} )\\= 104\sqrt{3}[/tex]
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Two samples, one of size 28 and the second of size 27, are selected to test the difference between two independent population means. How many degrees of freedom are used to find the critical value
To test the difference between two independent population means with two samples, you need to calculate the degrees of freedom (df). Here's a step-by-step explanation:
1. Identify the sample sizes: The first sample has a size of 28 (n1 = 28), and the second sample has a size of 27 (n2 = 27).
2. Calculate the degrees of freedom for each sample: For each sample, subtract 1 from the sample size. For sample 1, df1 = n1 - 1 = 28 - 1 = 27. For sample 2, df2 = n2 - 1 = 27 - 1 = 26.
3. Combine the degrees of freedom: Add the degrees of freedom from each sample together to get the total degrees of freedom: df = df1 + df2 = 27 + 26 = 53.
In this case, you will use 53 degrees of freedom to find the critical value for testing the difference between the two independent population means.
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For a given population, the mean of all the sample means Picture of sample size n, and the mean of all (N) population observations (X) are _______.
The mean of all the sample means (which is equal to the population mean) and the mean of all (N) population observations (X) are both equal to the population mean μ.
The mean of all the sample means of a given population is equal to the population mean, which is denoted by the symbol μ. This is a consequence of the central limit theorem, which states that the distribution of the sample means becomes approximately normal as the sample size n becomes larger, with mean equal to the population mean μ.
The mean of all (N) population observations (X) is simply the population mean, which is also denoted by the symbol μ. It represents the average value of the variable of interest across all individuals in the population.
Therefore, the mean of all the sample means (which is equal to the population mean) and the mean of all (N) population observations (X) are both equal to the population mean μ.
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A recent national survey found that high school students watched an average (mean) of 7.2 movies per month with a population standard deviation of 0.7. The distribution of number of movies watched per month follows the normal distribution. A random sample of 47 college students revealed that the mean number of movies watched last month was 6.2. At the 0.05 significance level, can we conclude that college students watch fewer movies a month than high school students
The population mean (μ) of high school students watching 7.2 movies per month, with a population standard deviation (σ) of 0.7. The sample size (n) of college students is 47, with a sample mean (x) of 6.2 movies per month.
We want to test if college students watch fewer movies per month than high school students at a 0.05 significance level.
To conduct this hypothesis test, we will use the one-sample z-test. The null hypothesis (H ₀) states that the mean number of movies watched by college students is equal to the population mean of high school students (μ = 7.2). The alternative hypothesis (H₁) states that the mean number of movies watched by college students is less than the population mean of high school students (μ < 7.2).
First, we need to calculate the standard error (SE) using the formula SE = σ/√n, where σ = 0.7 and n = 47. Next, we compute the z-score using the formula z = (x - μ)/SE. Once we have the z-score, we compare it to the critical value corresponding to the 0.05 significance level. If the z-score is less than the critical value, we reject the null hypothesis in favor of the alternative hypothesis.
By performing these calculations, we can determine whether there is enough evidence to conclude that college students watch fewer movies per month than high school students at the 0.05 significance level.
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You are planning an end of the year party for your math class. Your teacher needs help deciding which products are the better buy.
Determine the unit rate for each brand and determine what is the best purchase item.
a) What is the cost per bottle of 18 Gatorades?
b) What is the cost per bottle of 24 Gatorades?
c) Which is the better buy?
The cost per bottle is $0.62
The cost per bottle is $0.66
The pack of 24 is the better buy.
How do you determine the cost per bottle?The cost per bottle can be determined by dividing the total cost of a production run by the number of bottles produced. The total cost includes all of the expenses associated with producing and packaging the bottles
If 18 bottles cost $11.21
1 bottle costs 1 * 11.21/18
= $0.62
Again;
If 24 bottles costs $15.85
1 bottle will cost 1 * 15.85/24
= $0.66
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What is the max and min of F value (F statistics) to accept the null hypothesis for 7 df for numerator, and 12 df for denominator
To accept the null hypothesis, the calculated F-value should be between 0.142 and 3.490. If it falls outside this range, you would reject the null hypothesis.
To determine the max and min F-value to accept the null hypothesis for 7 degrees of freedom (df) for the numerator and 12 df for the denominator, you would consult the F-distribution table or use an online calculator.
At a common significance level (α) of 0.05, the critical F-values are:
- F(7, 12) lower critical value: 0.142
- F(7, 12) upper critical value: 3.490
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true or false? "Because in a randomized controlled trial (RCT), the assignment is random, therefore there is no coverage bias---by definition" g
The statement "Because in a randomized controlled trial (RCT), the assignment is random, therefore there is no coverage bias---by definition" g is false because, it is important to consider both randomization and other factors when assessing the potential for bias in an RCT.
Random assignment in an RCT can help to reduce selection bias, but it does not guarantee the absence of coverage bias.
Coverage bias can occur if the participants who are enrolled in the trial do not represent the population to which the results will be generalized.
For example, if the trial only includes participants who are healthier or more compliant than the typical patient, the results may not be applicable to the broader population.
Therefore, it is important to consider both randomization and other factors when assessing the potential for bias in an RCT.
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Suppose that there are no restrictions on how many pages a printer can print. How many ways are there for the 100 pages to be assigned to the four printers
There are 176,851 ways to assign the 100 pages to the four printers.
Since there are no restrictions on how many pages a printer can print, we can think of this problem as distributing 100 identical pages among 4 distinct printers. This is an example of a "balls and urns" problem, which can be solved using the stars and bars formula.
The stars and bars formula states that the number of ways to distribute k identical objects among n distinct containers is:
C(k+n-1, n-1)
where C represents the combination function. In this case, we have k = 100 identical pages and n = 4 distinct printers. Therefore, the number of ways to assign the pages to the printers is:
C(100+4-1, 4-1) = C(103, 3) = 176,851
So there are 176,851 ways to assign the 100 pages to the four printers.
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A random sample of 100 stores from a large chain of 1,000 garden supply stores was selected to determine the average number of lawnmowers sold at an end-of-season clearance sale. The sample results indicated an average of 6 and a standard deviation of 2 lawnmowers sold. A 95% confidence interval (5.623 to 6.377) was established based on these results. True or False: Of all possible samples of 100 stores drawn from the population of 1,000 stores, 95% of the sample means will fall between 5.623 and 6.377 lawnmowers
True, The 95% confidence interval (5.623 to 6.377) means that if we were to repeat this sampling process multiple times,
About 95% of the intervals we construct will contain the true population average number of lawnmowers sold. Since the sample size is 100, the Central Limit Theorem applies, and the distribution of sample means will be approximately normal, regardless of the population distribution.
Therefore, 95% of all possible samples of 100 stores drawn from the population of 1,000 stores will have a sample mean between 5.623 and 6.377 lawnmowers sold.
True. Based on the 95% confidence interval (5.623 to 6.377) calculated from the sample of 100 stores, it can be concluded that 95% of all possible sample means drawn from the population of 1,000 stores will fall within this range, with an average of 6 lawnmowers sold.
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A(n) ______________________________ is formed by one side of the triangle and the extension of an adjacent side.
A triangle is a three-sided polygon that consists of three sides and three angles. An extension of a side of a triangle is a line segment that is drawn from one of the endpoints of the side that extends beyond the side.
If we extend one side of the triangle and draw a line that passes through one of the adjacent vertices, the resulting shape is called a triangle's exterior angle. This exterior angle is formed by one side of the triangle and the extension of an adjacent side.
In other words, an exterior angle of a triangle is an angle that is formed by one side of a triangle and the extension of an adjacent side of the triangle.
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Use the Wronskian to prove that the given functions are linearly independent on the indicated interval. f(x) = x; g(x) = xe^x; h(x) = x^2e^x; the real line Given that y_1 = e^3x Is a solution of y" - 6y' + 9y = 0 on the interval (infinity < X < infinity), use the reduction of order to find a second solution Y_2.
To show that the functions f(x) = x, g(x) = xe^x, and h(x) = x^2e^x are linearly independent on the real line, we can use the Wronskian. The Wronskian of a set of functions is defined as the determinant of the matrix:
f g h
f' g' h'
f'' g'' h''
where f', g', h' are the first derivatives of f, g, h, respectively, and f'', g'', h'' are the second derivatives of f, g, h, respectively.
For the given functions, we have:
x xe^x x^2e^x
1 e^x+x*e^x 2xe^x+x^2e^x
0 e^x+e^x+x*e^x 2e^x+2xe^x+x^2e^x
Expanding the determinant, we get:
x(e^x+e^x+xe^x)(2e^x+2xe^x+x^2e^x) - xe^x(e^x+e^x+xe^x)(2xe^x+x^2e^x) + x^2e^x(e^x+e^x+xe^x)(e^x+xe^x)
= 2x^3e^(3x)
Since the Wronskian is nonzero for any value of x, the functions f(x) = x, g(x) = xe^x, and h(x) = x^2e^x are linearly independent on the real line.
To find a second solution Y_2 for the differential equation y" - 6y' + 9y = 0 given that y_1 = e^3x is a solution, we can use the method of reduction of order. Let Y_2(x) = v(x) e^3x, where v(x) is an unknown function. Then, we have:
Y_2' = v'e^3x + 3ve^3x
Y_2'' = v''e^3x + 6v'e^3x + 9ve^3x
Substituting these expressions into the differential equation and simplifying, we get:
v''e^3x + 3v'e^3x = 0
This is a separable differential equation that can be solved by integrating both sides:
v'(x) = c e^(-3x)
v(x) = -1/3 c e^(-3x) + k
where c and k are arbitrary constants. Therefore, the general solution to the differential equation is:
y(x) = c1 e^(3x) + c2 e^(3x)∫e^(-3x) dx = c1 e^(3x) - (1/3) c2 e^(3x) + k e^(3x)
where c1 and c2 are constants of integration, and k is an arbitrary constant determined by any initial or boundary conditions. Therefore, the second solution is:
Y_2(x) = v(x) e^(3x) = (-1/3) ∫c e^(-3x) e^(3x) dx + k e^(3x) = (-1/3) cx + k e^(3x)
where c is an arbitrary constant.
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ARCHERY The height, in feet, of an arrow can be modeled by the expression 89- 161², where is the time in
seconds. Factor the expression.
The factored expression is 89 - 161² = - ( 161 + √89 ) ( 161 - √89 ).
How to determine factored expression?The expression can be factored as:
89 - 161² = -161² + 89
Use the difference of squares formula, which states that:
a² - b² = ( a + b )( a - b )
In this case,:
a = 161 and b = √89
So, write:
-161² + 89 = - ( 161 + √89 ) ( 161 - √89 )
Therefore, the factored expression is:
89 - 161² = - ( 161 + √89 )( 161 - √89 )
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quizleet Harrison wants to compare the creativity scores of people who prefer Star Wars to those who prefer Star Trek. He explains that he is going to use a Pearson's r statistical test for analyze his data. What would you tell Harrison
It is important for Harrison to ensure that his sample is representative of the population he is interested in and that his measures of creativity are reliable and valid. He should also consider potential confounding variables, such as age or gender, that may affect his results.
I would advise Harrison that Pearson's r is a measure of correlation, which examines the linear relationship between two continuous variables. However, it may not be the best statistical test for comparing the creativity scores of people who prefer Star Wars to those who prefer Star Trek, as creativity scores may not necessarily have a linear relationship with preference for either franchise.
Instead, a more appropriate statistical test may be an independent samples t-test or ANOVA, which can compare the means of two or more groups on a continuous variable. These tests are more appropriate when the variable of interest is continuous and the groups being compared are categorical.
Additionally, it is important for Harrison to ensure that his sample is representative of the population he is interested in and that his measures of creativity are reliable and valid. He should also consider potential confounding variables, such as age or gender, that may affect his results.
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The number of individuals in a population divided by the area that the population takes up is known as the _______ of the population.
Answer:
density
Step-by-step explanation:
the number of population distributed in a certain area, that is generally in km², is the density.
It can be calculated with the following data: Number of population/km²
Extra information: it obviously is an approximated value, because in certain areas it can be much higher (metropolis, for example, generally have a very high population density, meanwhile in the countryside it can be much lower). Generally, it varies from area to area.
The number of individuals in a population divided by the area that the population takes up is known as the density of the population.
Population density refers to the number of individuals in a population per unit of area. It is a measure of how crowded or dispersed a population is within a given area.
Population density is calculated by dividing the total population of an area by the total land area or water area of that region. The resulting number is often expressed in individuals per square kilometer or square mile, depending on the units of measurement used.
Population density is an important ecological concept because it can affect the ability of a population to survive and thrive within a given area. Populations that are too dense may experience competition for resources, disease outbreaks, and other negative effects.
On the other hand, populations that are too dispersed may have trouble finding mates and maintaining genetic diversity. Population density can also be used to track changes in populations over time, and to inform conservation and management efforts.
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A truck left Town A for Town B at a speed of 80 km h. Two hours later, a car
travelling at 120 km/h also left Town A for Town B. The car caught up with the
truck 30 km away from Town B. Find the distance between the two towns.
The distance between Town A and Town B is calculated as 368 km.
What is distance?Distance is described as a numerical or occasionally qualitative measurement of how far apart objects or points are.
we have then equation that:
80 km/h x (t + 2) h = 120 km/h x t h + 30 km
we simplify the above equation :
80t + 160 = 120t + 30
50t = 130
t = 2.6 hours
Therefore, the distance between Town A and Town B will be the distance traveled by truck
= 80 km/h x (t + 2) h
= 80 km/h x 4.6 h
= 368 km
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Solve the problem using the appropriate counting principle(s). In how many ways can a committee of six be chosen from a group of eleven if Barry and Harry refuse to serve together on the same committee
Using the formula of combination, a committee of six can be chosen in 336 ways from a group of eleven if Barry and Harry refuse to serve together on the same committee
1. First, find the total number of ways to select six people from eleven without considering the restriction using the combination formula:
C(n, r) = n! / [r!(n-r)!],
where n is the total number of people, and r is the number of people to be selected.
In this case, n = 11 and r = 6. So the total number of ways without considering the restriction is:
C(11, 6) = 11! / [6!(11-6)!] = 11! / [6! * 5!] = 462 ways.
2. Now, consider Barry and Harry as a single unit, and we have 10 units in total (9 remaining people + 1 unit of Barry and Harry). We need to choose 4 more people from the remaining 9. So the number of ways is:
C(9, 4) = 9! / [4!(9-4)!] = 9! / [4! * 5!] = 126 ways.
3. Finally, apply the subtraction principle to exclude the cases where Barry and Harry are together. The total number of ways to form a committee of six, considering the restriction, is:
Total ways - Ways with Barry and Harry together = 462 - 126 = 336 ways.
So, in 336 ways, a committee of six can be chosen from a group of eleven if Barry and Harry refuse to serve together on the same committee.
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A machine produces bolts which are 6% defective. A random sample of 100 bolts produced by this machine are collected. a) Find the exact probability that there are at most 3 defectives in the sample. Write your answer in decimal form. b) Find the probability that there are at most 3 defectives by normal approximation. Write your answer in decimal form. c) Find the probability that between 4 and 7, inclusive, are defective by normal approximation. Write your answer in decimal form.
a)The exact probability that there are at most 3 defectives in the sample is 0.4234. b) The exact probability that there are at most 3 defectives in the sample is 0.4234. c) the probability that between 4 and 7, inclusive, are defective by normal approximation is 0.2
a) To find the exact probability that there are at most 3 defectives in the sample, we can use the binomial distribution formula. The probability of getting at most 3 defectives is the sum of the probabilities of getting 0, 1, 2, or 3 defectives.
P(X ≤ 3) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3)
Where X is the number of defective bolts in the sample.
Using the binomial distribution formula, we get:
P(X = k) = (n choose k) * p^k * (1-p)^(n-k)
Where n is the sample size (100), p is the probability of a bolt being defective (0.06), and k is the number of defective bolts.
P(X ≤ 3) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3)
= 0.4234
Therefore, the exact probability that there are at most 3 defectives in the sample is 0.4234.
b) To find the probability that there are at most 3 defectives by normal approximation, we need to calculate the mean and standard deviation of the binomial distribution.
Mean = np = 100 * 0.06 = 6
Standard deviation = sqrt(np(1-p)) = sqrt(100 * 0.06 * 0.94) = 2.424
We can then use the normal distribution to approximate the binomial distribution:
P(X ≤ 3) ≈ P(Z ≤ (3.5 - 6)/2.424)
Where Z is a standard normal random variable.
Using a standard normal table or calculator, we get:
P(Z ≤ -1.23) = 0.1093
Therefore, the probability that there are at most 3 defectives by normal approximation is 0.1093.
c) To find the probability that between 4 and 7, inclusive, are defective by normal approximation, we can use the same approach as in part b.
Mean = np = 100 * 0.06 = 6
Standard deviation = sqrt(np(1-p)) = sqrt(100 * 0.06 * 0.94) = 2.424
We can then use the normal distribution to approximate the binomial distribution:
P(4 ≤ X ≤ 7) ≈ P(3.5 ≤ X ≤ 7.5) ≈ P((3.5 - 6)/2.424 ≤ Z ≤ (7.5 - 6)/2.424)
Where Z is a standard normal random variable.
Using a standard normal table or calculator, we get:
P(-1.23 ≤ Z ≤ 0.62) = 0.2816
Therefore, the probability that between 4 and 7, inclusive, are defective by normal approximation is 0.2
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The radius of a circle is 7 meters. What is the length of a 135° arc?
The measure of the length of the given arc is 16.5 m.
Given that a circle with radius 7 m we need to find the length of an arc which has a central angle of 135°,
The length of an arc = central angle / 360° × π × diameter
= 135° / 360° × 3.14 × 14
= 16.5 m
Hence, the measure of the length of the given arc is 16.5 m.
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When a supervisor for a survey telephones a subset of the respondents to verify certain information, it is an example of _________.
When a supervisor for a survey telephones a subset of the respondents to verify certain information, it is an example of quality control or data validation. This process helps ensure the accuracy and reliability of the survey responses.
When a supervisor for a survey telephones a subset of the respondents to verify certain information, it is an example of follow-up or validation. This is a common practice in survey research to ensure the accuracy and validity of the data collected.
During the follow-up process, a subset of the respondents are contacted again to confirm or validate their responses. This may involve asking additional questions or asking the respondent to clarify or elaborate on their previous answers. The purpose of the follow-up is to ensure that the data collected is reliable and accurate, and to identify and correct any errors or discrepancies.
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In stroke play, player A concedes a short putt to player B on the 7th hole. Player B picks up his or her ball and tees off on the 8th hole before holing out on the 7th hole. What is the ruling
In stroke play, when Player A concedes a short putt to Player B on the 7th hole and Player B picks up their ball and tees off on the 8th hole before holing out on the 7th hole, the ruling is that Player B incurs a penalty for not completing the hole.
In stroke play, if player A concedes a short putt to player B on the 7th hole, it means that player B can pick up their ball without completing the hole.
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