The circumference of the circle is 88in (nearest inches)
What is circumference of circle?The circumference is the perimeter of a circle or ellipse. That is, the circumference would be the arc length of the circle, as if it were opened up and straightened out to a line segment. More generally, the perimeter is the curve length around any closed figure.
The circumference of a circle is given as;
C = πd
d = diameter = 28in
C = 3.14 × 28
C = 88 in ( nearest inches)
therefore the circumference of the circle is 88in
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The number of bacteria in a culture is increasing according to the law of exponential growth. There are 135 bacteria in the culture after 2 hours and 385 bacteria after 4 hours.. use the model to determine the number of bacteria after 8 hours. (round your answer to the nearest whole number.)
The number of bacteria after 8 hours is approximately 2,713.
Let's apply the exponential growth formula:
N = N0 * e(rt),
N is the number of bacteria at a particular period. N0 is the initial bacterial population, e is the mathematical constant (about equal to 2.71828), r is the growth rate, and t is the amount of time that has passed.
The information provided in the problem can be used to determine the growth rate:
N1 = N0 * e(r*2)
N2 = N0 * e(r*4)
To get eliminate N0, divide the second equation by the first equation:
N2/N1 = e(r4) / e(r2)
385/135 = e(r4) / e(r2)
If we condense this expression, we get:
e(r*2) = 385/135
e(r*2) = 2.8519
When we take the natural logarithm of both sides, we get:
r*2 = ln(2.8519)
r = ln(2.8519)/2
r = 0.5457 (rounded to 4 decimal places)
The number of bacteria after 8 hours can now be determined using the exponential growth algorithm once more:
N = N0 * e(rt)
N = 135 * e(0.5457*8)
N = 2,713 (rounded to the nearest whole number)
Therefore, the number of bacteria after 8 hours is approximately 2,713.
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10. Which is the bigger portion, ½ of a 12 inch pizza, or % of a 9 inch pizza? Give a reason for your
answer.
½ of a 12 inches pizza represents the bigger portion.
What is the area of the circle?It is the close curve of an equidistant point drawn from the center. The radius of a circle is the distance between the center and the circumference.
Let r be the radius of the circle. Then the area of the circle will be
A = πr² square units
½ of a 12-inch pizza, then the area is given as,
A = (π / 2) x (12 / 2)²
A = 56.52 square inches
30% of a 9-inch pizza. Then the area is given as,
A = 0.30 x π (9 / 2)²
A = 19.0755 square inches
½ of a 12 inches pizza represents the bigger portion.
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Can you find out the area of these shapes
1) The Area of the first compound shape is given as = 52cm
2) The area of the second shape is given as = 47cm
Note that the method for deriving this area of the shapes is by dividing them into "regular" shapes as shown in the attached images.
A compound form is created by combining simple shapes. It's also known as a "composite" or "complex" form.
For Shape A:
We have a triangle and a rectangle when the compound shape is de-regularized.
The dimensions of the triangle are:
Base 8cm
Height 3cm
Since the area of a triangle is given as:
1/2 B * H,
The area of the triangle is = 1/2 * 8 * 3cm
= 12cm
For the rectangle, the area of a rectangle is given as L * B. Since
L = 8cm and
B = 5cm
The area = 8* 5 = 40cm
The total area of Shape A = 40cm + 12cm
= 52cm
For Shape B:
We have two rectangles and one right-angled triangle when the shape is "converted".
The dimensions of rectangle 1 are:
L = 3
B = 2
Area = 6
The dimensions of rectangle 2 =
L = 8cm
B = 4cm
Area = 32cm
The dimension of the Right angled triangle is:
Base = 6cm
Height = 3cm (that is 7-4)
Thus:
The area of the triangle is:
1/2 * 6* 3
= 9cm
Thus the total area of the second shape is:
= 32 + 6 + 9
= 47cm
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i^{11} + i^{16} + i^{21} + i^{26} + i^{31}
Answer:
Below
Step-by-step explanation:
For this , I will assume i = [tex]\sqrt{-1}[/tex]
i^{11} + i^{16} + i^{21} + i^{26} + i^{31} =
- i +1 +i -1 - i = - i
The step function f(x) is graphed.
What is the value of f(0)?
• -2
• -1
• 0
• 1
The value of f(0) is -2.
Option A is the correct answer.
What is a function?A function has an input and an output.
A function can be one-to-one or onto one.
It simply indicated the relationships between the input and the output.
Example:
f(x) = 2x + 1
f(1) = 2 + 1 = 3
f(2) = 2 x 2 + 1 = 4 + 1 = 5
The outputs of the functions are 3 and 5
The inputs of the function are 1 and 2.
We have,
From the graph, we see that,
f(x) = -1 for -1 ≤ x < 0
Similarly,
f(x) = -2 for 0 ≤ x < 1 _____(1)
Now,
The value of f(x) at x = 0.
From (1),
f(0) = -2
Thus,
The value of f(0) is -2.
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z₁ = 3 cis(pi) and z₂ =5 cis(pi/2) If z₁ x z₂ = a+bi. then a = _ and b= _
The solution is, a = 0 & b = -15.
What is complex number?A complex number is a number of the form a + bi, where a and b are real numbers ; This way, a complex number is defined as a polynomial.
here, we have,
z₁ = 3 cis(pi) and z₂ =5 cis(pi/2)
we know, cisx = cosx + i sinx
so, we get,
z₁ = 3 cis(pi) = 3(-1)
and z₂ =5 cis(pi/2) = 5( i.1)
If z₁ x z₂ = a+bi.
or, -3 * 5i = a+ ib
or, -15i = a +ib
Hence, The solution is, a = 0 & b = -15.
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I need helps with this please
The missing statement from his process;
RM = RL and MA = LA
Radii of the constructed arc are some length.
What are angle bisectors?Angle bisectors are lines that cut across the angle under consideration. The term "bisect" means to divide into two equal portions. The considered angle is therefore divided in half by the bisected halves.
Given:
Oleg is writing proof of the construction of an angle bisector.
The missing statement from his process;
RM = RL and MA = LA
Radii of the constructed arc are some length.
From the reflexive property;
RA ≅ RA.
And ΔRMA ≅ ΔRLA, by SSS criterion.
And corresponding angles of congruent angles
∠MRA ≅ ∠LRA.
Therefore, ∠MRA ≅ ∠LRA.
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Suppose annual salaries for sales associates from a particular store have a bell-shaped distribution with a mean of $32,500 and a standard deviation of $2,500. Refer to Exhibit 3-3. The z-score for a sales associate from this store who earns $37,500 is
With a mean of $32,500 and a standard deviation of $2,500. The z-score for a sales associate who earns $37,500 is 2.
The z-score, also known as a standard score, is a measure of how many standard deviations a given value is from the mean. It is used to standardize the data and make it easier to compare and interpret. The formula for the z-score is:
z = (x - μ) / σ
where x is the value of interest, μ is the mean, and σ is the standard deviation.
In this case, the mean annual salary for sales associates from a particular store is $32,500 and the standard deviation is $2,500. We want to find the z-score for a sales associate who earns $37,500. Plugging in the values, we get:
z = ($37,500 - $32,500) / $2,500 = 2
This means that the sales associate's salary is 2 standard deviations above the mean.
Interpreting the z-score can help us understand how unusual or typical a given value is in comparison to the mean. In this case, a z-score of 2 indicates that the sales associate's salary is relatively high compared to the mean, but it is not an extremely high salary.
We can use a standard normal table to find the proportion of the data that falls below a given z-score, or to find the corresponding value for a given proportion of the data.
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Complete the input-output table:
n 4n-5
Answer:
4(1) - 5 = -1
4(2) - 5 = 3
4(3) - 5 = 7
Step-by-step explanation:
Replace variable "n" with values of "n".
4n-5 when n = 1 is 4(1) - 5
4(1) - 5 = -1
4(2) - 5 = 3
4(3) - 5 = 7
I will give brainliest and ratings if you get this correct
Answer:
[tex]\textsf{Increasing}: \quad (- \infty, -1) \cup (1, \infty)[/tex]
[tex]\textsf{Decreasing}: \quad(-1, 1)[/tex]
[tex]\textsf{Minimum}: \quad (1, -4)[/tex]
[tex]\textsf{Maximum}: \quad (-1, 0)[/tex]
Step-by-step explanation:
[tex]\textsf{A function is \textbf{increasing} when the \underline{gradient is positive}}\implies f'(x) > 0[/tex]
[tex]\textsf{A function is \textbf{decreasing} when the \underline{gradient is negative}} \implies f'(x) < 0[/tex]
Given function:
[tex]f(x)=x^3-3x-2[/tex]
Differentiate the given function:
[tex]\implies f'(x)=3x^2-3[/tex]
To find the interval where f(x) is increasing, set the differentiated function to more than zero:
[tex]\implies 3x^2-3 > 0[/tex]
[tex]\implies 3(x^2-1) > 0[/tex]
[tex]\implies x^2-1 > 0[/tex]
[tex]\implies x^2 > 1[/tex]
[tex]\implies x < -1, \;\;\; x > 1[/tex]
So the interval on which function f(x) is increasing is:
[tex](- \infty, -1) \cup (1, \infty)[/tex]
To find the interval where f(x) is decreasing, set the differentiated function to less than zero:
[tex]\implies 3x^2-3 < 0[/tex]
[tex]\implies 3(x^2-1) < 0[/tex]
[tex]\implies x^2-1 < 0[/tex]
[tex]\implies x^2 < 1[/tex]
[tex]\implies -1 < x < 1[/tex]
So the interval on which function f(x) is decreasing is:
[tex](-1, 1)[/tex]
To find the relative extrema, set the differentiated function to zero and solve for x:
[tex]\implies 3x^2-3=0[/tex]
[tex]\implies 3(x^2-1)=0[/tex]
[tex]\implies x^2-1=0[/tex]
[tex]\implies x^2=1[/tex]
[tex]\implies x=-1,\;\;x=1[/tex]
To find the y-coordinates of the relative extrema, substitute the found values of x into the function and solve for y:
[tex]\implies f(-1)=(-1)^3-3(-1)-2=0[/tex]
[tex]\implies f(1)=(1)^3-3(1)-2=-4[/tex]
Therefore the minimum and maximum points of the function are:
[tex]\textsf{Minimum}: \quad (1, -4)[/tex]
[tex]\textsf{Maximum}: \quad (-1, 0)[/tex]
2. Determine a line that is parallel to the line y=-5x-5 passes through the point (1, 2). Which
of the following is an equation of this line?
Answer: y = 5x - 3
Step-by-step explanation:
The lines need the same slope
2 = 5(1) + b
2 = 5 + b
-5 -5
-3 = b
y = 5x - 3
grace started reading her chemistry book 3 hours and 42 minutes before 19:12. What time did she start reading her book? Give your answer in 24 hour time.
Answer:
15:30 or 3:30
Step-by-step explanation:
19:12=18:72
18:72-3:42= 15:30
15:30 or 3:30
The time when Grace started reading her chemistry book is calculated as 15:30 in 24-hour format.
To find out what time Grace started reading her chemistry book in 24-hour format,
Simply subtract 3 hours and 42 minutes from 19:12.
Convert 19:12 to minutes: 19 hours × 60 minutes/hour + 12 minutes
= 1152 minutes.
Subtract 3 hours and 42 minutes from 1152 minutes:
1152 minutes - (3 hours × 60 minutes/hour + 42 minutes)
= 1152 - (180 + 42)
= 930 minutes.
Convert the remaining minutes back to hours and minutes:
930 minutes ÷ 60 minutes/hour
= 15 hours with a remainder of 30 minutes.
Combine the results:
Grace started reading her chemistry book at 15:30 in 24-hour format.
Therefore, time when Grace start her reading of chemistry book is 15:30 in 24-hour format.
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A farmer packed some potatoes and carrots into
bags. Of these bags, 3/5 were bags of potatoes and
the rest were bags of carrots. After selling 45 bags of
potatoes and 3/4 of the bags of carrots, the farmer
had 1/4 of the bags left. How many bags of potatoes
and carrots did the farmer sell in all?
The number of bags of potatoes and carrots did the farmer sell in all is 75 bags.
What is word problem?A word problem is a few sentences describing a 'real-life' scenario where a problem needs to be solved by way of a mathematical calculation.
Given that, a farmer is selling potatoes and carrots into bags, 3/5 were bags of potatoes and the rest were bags of carrots. He sold 45 bags of potatoes and 3/4 of the bags of carrots, and had 1/4 of the bags left.
The bags of potato = 3x/5
The bags of carrot = 2x/5
Therefore, according to question,
x-45-3x/5×2x/5 = x/4
7x/10-x/4 = 45
18x/40 = 45
x = 45×40/18
x = 100
Total bags sold = 100×2/5+3/5+45 = 75
Hence, the number of bags of potatoes and carrots did the farmer sell in all is 75 bags.
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Does anyone know the answer to these?
The slopes of the lines are listed below:
Case 1: m = 1
Case 2: m = - 4 / 5
Case 3: m = - 4
Case 4: m = 5
Case 5: m = 2 / 7
Case 6: m = - 1
Case 7: m = 0
Case 8: m = NaN (Not a Number)
Case 9: m = 3 / 5
Case 10: m = - 8 / 3
How to determine the slope of a line
In this question we find ten cases of lines, whose slopes must be determined according to the following rules:
If the line is parallel with the x-axis, then its slope is zero.If the line is parallel with the y-axis, then its slope is undefined. If the line is oblique, then the slope is determined by secant line formula:Now we proceed to determine the slope for each case:
Case 1
m = (5 - 0) / [0 - (- 5)]
m = 1
Case 2
m = (- 3 - 1) / [0 - (- 5)]
m = - 4 / 5
Case 3
m = (- 3 - 1) / (1 - 0)
m = - 4
Case 4
m = [1 - (- 4)] / (1 - 0)
m = 5
Case 5
m = (3 - 1) / [0 - (- 7)]
m = 2 / 7
Case 6
m = (0 - 3) / (3 - 0)
m = - 1
Case 7
m = 0
Case 8
m = NaN (Not a Number)
Case 9
m = [- 1 - (- 4)] / (5 - 0)
m = 3 / 5
Case 10
m = (- 4 - 0) / (1.5 - 0)
m = - 4 / 1.5
m = - 8 / 3
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find the area of the given circle. round to the nearest tenth. a circle with radius measuring 3 point 5 centimeters. (Use 3.14 for π)
The formula for the area of a circle is A = πr^2, where r is the radius.
The area of the circle with a radius of 3.5 centimeters is approximately 38.5 square centimeters.
Substituting r = 3.5 centimeters and using π ≈ 3.14, we get:
A = 3.14 × (3.5)^2
A = 38.465 square centimeters (rounded to the nearest tenth)
Consequently, the radius of the circle is 3.5 centimetres, and its area is roughly 38.5 square centimeters.
The area of a circle is the measure of the region enclosed by the circle in a two-dimensional space. It is the amount of space inside the circle and is typically measured in square units, such as square centimeters (cm²) or square meters (m²). The formula to calculate the area of a circle is:
Area = π x radius²
Where π (pi) is a mathematical constant that represents the ratio of the circumference of a circle to its diameter, which is approximately 3.14159, and radius is the distance from the center of the circle to any point on the circumference. The area formula can also be expressed in terms of the diameter:
Area = π x (diameter/2)²
This formula tells us that the area of a circle depends on the length of its radius or diameter, and it allows us to calculate the area of any circle given either of these two measurements.
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A number line goes from 0 to 10. A closed circle is shown at point 0 and 5. Point 0 is labeled Start and point 5 is labeled Finish.
A 5-mile race takes place along a straight course. The number line shows the distance, in miles, from start to finish. The race director would like to place a water station along the course such that the distance from the start to the water station and the water station to the finish line is in a 7:5 ratio. Where would the water station be located? Round to the nearest tenth of a mile, if necessary.
The water station will be placed about
miles from the start.
The water station would be located at 2.92 miles. Round to the nearest tenth of a mile, the answer is 2.9 miles.
What is the distance?Distance is a numerical value that quantifies "how much ground an object has traveled" while in motion. Distance is calculated as the sum of a person's movement and time.
Call the distance between the starting point and the water station x. 5 - x meters separate from the water station from the finish line.
We may write the following equation because we are aware that the ratio between these two lengths is 7:5.
x / (5 - x) = 7/5
Expanding and solving for x, we get:
5x = 7(5) - 7x
12x = 35
x = 35/12 = 2.92 miles
Therefore, the distance of the water station would be 2.9 miles.
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Find the (a) mean, (b) median, (c) mode, and (d) midrange for the data and then (e) answer the given questions.
Listed below are the highest amounts of net worth (in millions of dollars) of all celebrities. What do the results tell us about the population of all celebrities? Based on the nature of the amounts, what can be inferred about their precision?
Look at pic for numbers
Question content area bottom
Part 1
a. Find the mean.
Please don’t answer with the wrong answer! I’m tried of getting it wrong!!
According to the information, the mean of these values would be: 169
How to calculate the mean of this series of numbers?To calculate the mena of this series of numbers we must add all the values and multiply them by the number of values available. In this case, we would have to divide it by 10. The procedure is shown below:
290 + 190 + 175 + 165 + 155 + 155 + 140 + 140 + 140 + 140 = 1,6901,690 / 10 = 169According to the above, the mean of this operation would be 169.
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Find the directional derivative of f(x,y,z)=xy+z^3 at the point (2,3,1) in the direction of a vector making an angle of 3π/4 with ∇f(2,3,1). Expert Answer.
The directional derivative of f(x, y, z) = [tex]xy+z^{3}[/tex] at the point (2, 3, 1) in the direction of a vector making an angle of 3π/4 with the gradient of f at that point is √2 (3cos(3π/4) + 2sin(3π/4)).
To find the directional derivative of f(x, y, z) = xy + z^3 at the point (2, 3, 1) in the direction of a vector making an angle of 3π/4 with the gradient of f at that point, we need to calculate the gradient of f at that point and then use it to find the dot product with the given direction vector.
The gradient of f at the point (2, 3, 1) is given by ∇f(2, 3, 1) = (y, x, 3z^2) = (3, 2, 3).
The direction vector in the direction of 3π/4 with the gradient can be found as follows:
Let [tex]d = (cos(3\pi /4), sin(3\pi /4), 0)[/tex]
The directional derivative of f in the direction d at the point (2, 3, 1) is given by
∇f(2, 3, 1) . d = [tex](3, 2,3).(cos(3\pi /4), sin(3\pi /4),0)[/tex]
= [tex]3cos(3\pi /4)+2sin(3\pi /4)[/tex]
= √2 (3cos(3π/4) + 2sin(3π/4))
So the directional derivative of f in the direction of a vector making an angle of 3π/4 with the gradient of f at (2, 3, 1) is √2 (3cos(3π/4) + 2sin(3π/4)).
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Bethany has a photo website where she places photos that she has taken so others can see them. Below is how many likes each of her current photos were given: 10, 13, 15, 15, 17, 29 What is the average amount of likes each of her photos got? Hint: The average is your mean. 22 15 15.5 16.5
The average number of likes will be 16.5. the correct option is D.
What is a mean?Mean is defined as the ratio of the sum of the number of data sets to the total number of data. The mean is calculated by adding all the data points and dividing it by the total number of the data.
Given that Bethany has a photo website where she places photos that she has taken so others can see them. Below is how many likes each of her current photos was given: 10, 13, 15, 15, 17, 29.
The average will be calculated as:-
Mean = ( 10 + 13 + 15 + 15 + 17 + 29 ) / 6
Mean = 99 / 6
Mean = 16.5
Therefore, the average number of likes will be 16.5. the correct option is D.
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Please help !! I need help
Answer:
Step-by-step explanation:
197.97
PLEASE HELP:
light travels at a speed of 1.86 x 10^5 miles per second. it takes about 15,000 seconds for the light to reach Neptune. write your answer in scientific notation.
The distance that the light travels in the scientific notation will be 2.79 × 10⁹ miles.
What is speed?Speed is defined as the length traveled by a particle or entity in an hour. It is a scale parameter. It is the ratio of length to duration.
We know that the speed formula
Speed = Distance/Time
The light travels at a speed of 1.86 × 10⁵ miles per second. And it takes about 15,000 seconds for the light to reach Neptune.
Then the number of miles is given as,
1.86 × 10⁵ = d / 15,000
d = 1.86 × 10⁵ × 15,000
d = 2.79 × 10⁹ miles
The distance that the light travels in the scientific notation will be 2.79 × 10⁹ miles.
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a researcher for an organization that collects and reports on crime has data on the murder rates for 10 states from a certain year. the murder rate is the number of murders per 100,000 inhabitants. the murder rate sample data are reproduced below. use a ti-83, ti-83 plus, or ti-84 to calculate the sample standard deviation and the sample variance of the murder rates. round your answers to one decimal place. murders per 100k inhabitants 7.1 9 5.6 2.5 4.8 7 3.6 2.1 6.1 helpcopy to clipboarddownload csv provide your answer below: $$standard deviation
The sample standard deviation of murder rates is approximately 2.2, and the sample variance is approximately 4.9. The standard deviation and variance are measured in the same units as the original data (murders per 100,000 inhabitants), squared and unsquared.
We can use a TI-83, TI-83 Plus, or TI-84 to calculate the sample standard deviation and variance of the murder rates:
Enter the following information into a list: Enter the data into L1 by pressing STAT, then ENTER.Determine the standard deviation of the sample: STAT, CALC, and 1-VarStats are the commands. Enter L1 into the list and hit ENTER. The Sx value represents the standard deviation (s).Determine the sample variance: The sample variance is equal to the square of the sample standard deviation. To get the sample variance (s2), we can square the Sx value calculated in step 2.We get the following results using this method:
2.209 is the sample standard deviation (s).
4.877 sample variance (s2) (rounded to three decimal places)
As a result, the sample standard deviation of the murder rates is about 2.2, and the sample variance is about 4.9. It should be noted that the standard deviation and variance are measured in the same units as the original data (murders per 100,000 inhabitants), squared and unsquared.
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A large data set contains information on all registered republicans in the United States. The following information is recorded.- Name
- Age
- Gender
- Home address
- Whether they voted or not in 2016 presidential election
Which of the following questions could not be answered based solely on the information in this data set?answer choicesa. What percent of registered republican voters are male?b. Which state had the most registered republican voters vote in the 2016 presidential election?c. What is the average age of registered republican voters?d. How many registered republicans voted for Gary Johnson in the 2016 presidential election.
The question which could not be answered based solely on the information in this data set is How many registered republicans voted for Gary Johnson in the 2016 presidential election? So, correct answer is option (d).
We have a large data consists of information on all registered republicans in the United States. The information of voters which present in data are Name, Gender, Age, Home address, Whether they voted or not in 2016 presidential election. We have to determine the question which answer is not possible on basis of this data. Let's consider the options one by one.
a) Here, gender and voters who vote or not in 2016 election, so it is easy to determine the percent of registered republican voters are male.
b) Address details and the information of voters who vote or not, helps to determine the state which had the most registered republican voters vote in the 2016 election.
c) The Age and registered voter information that he vote or not is used to determine the average age of registered republican voters.
d) Now, there is no information regarding the voters choice for voting their votes. So, it not determined that how many voters voted for Gary Johnson in the 2016 presidential election. This is write choice here.
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A scientist calculates that a test at the significance level has probability 0.23 of making a type ii error when a specific alternative is true.What is the power of the test against this alternative?O 0.05O 0.23O 0.72O 0.95O 0.77
Answer option 5) 0.77 is correct. The power of the test against this alternative is 0.77, given the calculations of the Scientist.
The power of a statistical test is the probability of correctly rejecting a false null hypothesis. In this case, the null hypothesis is rejected in favor of a specific alternative, and the scientist has calculated that the probability of making a type II error (failing to reject the null hypothesis when the alternative is actually true) is 0.23.
Therefore, the power of the test is the complement of the type II error probability, which is 1 - 0.23 = 0.77. This means that the test has a 77% chance of correctly rejecting the null hypothesis when the alternative is actually true. Answer option 5) 0.77 is correct.
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What’s the answer for these two
The amount freedome ride charge more than Envo car in d miles is $20.05
What is word problem?word problem is a math problem written out as a short story or scenario. Basically, it describes a realistic problem and asks you to imagine how you would solve it using math. If you've ever taken a math class, you've probably solved a word problem.
The total charge for Enzo car =$50.50 +8¢ = $50.50 + $0.08 = $50.58
The total charge for Freedom = $70.50 + 12¢
= $70.50 + $0.12
= $70.62
therefore in d miles ;
Enzo will charge $50.58d
freedome will charge
$70.62d
therefore the amount freedome will charge more than Enzo car is $70.62 - $50.58
= $20.05
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According to a survey, 56% of young Americans aged 18 to 29 say the primary way they watch television is through streaming services on the internet. Suppose a random sample of 350 Americans from this group is selected. Would it be surprising to find that more than 70% of the sample watched television primary through streaming services? (Include z-score)
Answer:
The z-score is a statistical measure that describes how far a sample estimate is from the population parameter in standard deviation units. It is calculated by taking the difference between the sample estimate and the population parameter, and dividing it by the standard deviation of the sampling distribution of the estimate. The resulting z-score can be used to calculate the probability of observing a sample estimate as extreme or more extreme than the one obtained, assuming the null hypothesis is true.
In this case, the sample estimate is the proportion of individuals who watch television primarily through streaming services, which is 70%, and the population parameter is the proportion of all individuals who watch television primarily through streaming services, which is 56%. The sample size is 350. The null hypothesis is that there is no difference between the sample and population proportions, and the alternative hypothesis is that the sample proportion is greater than the population proportion.
To calculate the z-score, we need to determine the standard error of the sampling distribution of the proportion. The standard error is a measure of the variability of sample estimates due to random sampling variation. It is calculated by taking the square root of the population proportion times one minus the population proportion, divided by the sample size. In this case, the standard error is:
standard error = sqrt[(0.56 * (1 - 0.56)) / 350] = 0.028
The z-score can now be calculated as:
z-score = (0.7 - 0.56) / 0.028 = 5.19
This z-score is quite large, indicating that the sample estimate is more than 5 standard errors away from the population parameter. This suggests strong evidence against the null hypothesis, as the probability of observing a sample estimate as extreme or more extreme than the one obtained is very low, assuming the null hypothesis is true.
In other words, the result of observing a sample proportion of 70% or above is highly unlikely to have occurred by chance alone, assuming that the true population proportion is 56%. This result provides evidence in support of the alternative hypothesis, which states that the sample proportion is greater than the population proportion.
The students in Colleen's class got to choose whether to visit the zoo or the aquarium. 24 students went to the zoo and 3 students went to the aquarium. What is the ratio of the number of students who went to the aquarium to the total number of students?
The solution is, the ratio of the number of students who went to the aquarium to the total number of students is 1:9.
What is ratio?The ratio is defined as the comparison of two quantities of the same units that indicates how much of one quantity is present in the other quantity.
here, we have,
24 students went to the zoo and 3 students went to the aquarium.
i.e. we get,
24 students went to the zoo
3 went to the aquarium
so, total no. of students = 24+ 3
= 27
then, we have,
the ratio of the number of students who went to the aquarium to the total number of students is = 3 : 27
= 1: 9
Hence, The solution is, the ratio of the number of students who went to the aquarium to the total number of students is 1:9.
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A spam filer is designed by screening commonly occurring phrases in spam. Suppose that 60% of email is spam. In 20% of the spam emails, the phrase "free gift card" is used. In non-spam emails, 99.5% of them do not mention "free gift card". What is the probability that a newly arrived email which does mention "free gift card", is not spam?
The probability that a newly arrived email which does mention "free gift card", is not spam is 0.0165.
Let S be the event that an email is spam, and let F be the event that an email mentions "free gift card". We want to find P(S' | F), the probability that the email is not spam given that it mentions "free gift card".
We can use Bayes' theorem to find P(S' | F):
P(S' | F) = P(F | S') P(S') / P(F)
We can calculate each of these probabilities as follows:
P(F | S') = the probability that a non-spam email mentions "free gift card". From the problem, we know that this probability is 0.005 (i.e., 99.5% of non-spam emails do not mention "free gift card").
P(S') = the probability that an email is not spam. From the problem, we know that this probability is 0.4 (i.e., 60% of emails are spam, so 40% are not spam).
P(F) = the probability that an email mentions "free gift card". This can be calculated using the law of total probability:
P(F) = P(F | S) P(S) + P(F | S') P(S')
= 0.20 × 0.60 + 0.005 × 0.40
= 0.121
In the first term, we use the given probability that 20% of spam emails mention "free gift card". In the second term, we use the probability that 0.5% of non-spam emails mention "free gift card".
Plugging these values into Bayes' theorem, we get:
P(S' | F) = 0.005 × 0.4 / 0.121 ≈ 0.0165
Therefore, the probability that a newly arrived email which does mention "free gift card" is not spam is approximately 0.0165 or 1.65%.
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Write ____ as a complex number in the form a + bi, where a and b are real numbers.
[tex] \boxed{\sf Option \: A\text{:} \: \dfrac{1 + \sqrt{-32}}{4} = \dfrac{1}{4} + \sqrt{2}i} [/tex]
[tex] \\ \\ [/tex]
Explanation:We are asked to express the given number in the form a + ib, also known as the algebraic form.
[tex] \\ \\ [/tex]
Algebraic form of a complex number[tex] \\ \\ [/tex]
[tex] \sf z = a + ib \\[/tex]
Where:
✰ a and b are real numbers and are the complex number's real part and imaginary part, respectively.
[tex] \\ \\ [/tex]
✰ i is the imaginary unit number and can be expressed as follows:
[tex] \\ \sf i= \sqrt{-1}[/tex]
[tex] \\ \\ [/tex]
Simplify the number's expression[tex] \\ \\ [/tex]
[tex] \sf z = \dfrac{1 + \sqrt{-32}}{4} = \dfrac{1 + \sqrt{32 \times (-1)}}{4} \\ \\ \\ \sf \diamond \: We \: know \: that \: \sqrt{ab} = \sqrt{a} \times \sqrt{b}. \\ \\ \implies \dfrac{1 + \sqrt{32 \times (-1)}}{4} = \dfrac{1 + \sqrt{32}\times \sqrt{-1}}{4}[/tex]
[tex] \\ \\ \sf \implies \dfrac{1 + \sqrt{32}\times \sqrt{-1}}{4} = \dfrac{1 + \sqrt{16 \times 2} \times \sqrt{-1}}{4} = \dfrac{1 + 4\sqrt{2} \times \sqrt{-1}}{4}[/tex]
[tex] \\ \\[/tex]
[tex] \diamond \: \sf Substitute \: \sqrt{-1} = i. \\ \\ \implies \sf \dfrac{1 + 4\sqrt{2}\times \sqrt{-1}}{4} = \dfrac{1 + 4\sqrt{2} \times i}{4} = \dfrac{1 + 4i\sqrt{2}}{4} [/tex]
[tex] \\ \\ \: \sf \diamond \: Simplify \: knowing \: that \: \dfrac{a + b}{c} = \dfrac{a}{c}+\dfrac{b}{c}. [/tex]
[tex] \\ \\ \\ \implies \: \sf \dfrac{1 + 4i\sqrt{2}}{4} = \dfrac{1}{4} + \dfrac{4i\sqrt{2}}{4} = \boxed{\sf \dfrac{1}{4} + \sqrt{2}i} [/tex]
[tex] \\ [/tex]
Therefore, the first option is correct.
[tex] \\ \\ \\ [/tex]
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Math Question...............
Answer:12.90
Step-by-step explanation: