Answer:
Convenience sampling
Step-by-step explanation:
When a researcher gives more credence to ease when performing its sampling procedure, such sampling process may be referred to as convenience sampling. As described in the scenario above, rather than having to take a Systematic approach at examining the population so as to decide on the best sampling strategy to employ, the reporter of the student newspaper decides to take the easy path towards gathering the opinion of students by interviewing the first 12 students who are willing to give their opinion without any further consideration. Here, the reporter failed to eliminate any sort of possible bias which may be present, as all was sacrificed for the sake of convenience or ease.
Jessica is walking home from a friend's house. After two minutes she is 0.6 miles from home. Twelve minutes after leaving, she is 0.1 miles from home. What is her rate in miles per hour
A new surgery is successful of the time. If the results of such surgeries are randomly sampled, what is the probability that more than of them are successful
Complete question is;
A new surgery is successful 85% of the time. If the results of 7 such surgeries are randomly sampled, what is the probability that more than 4 of them are successful?
Carry your intermediate computations to at least four decimal places, and round your answer to at least two decimal places
Answer:
P(X > 4) = 0.93
Step-by-step explanation:
This is a binomial probability distribution problem with the formula;
P(X = x) = C(n, x) × p^(x) × (1 - p)^(n - x)
We are told that a new surgery is successful 85% of the time. Thus;
p = 85% = 0.85
n = 7
probability that more than 4 of them are successful would be;
P(X > 4) = P(5) + P(6) + P(7)
P(5) = C(7,5) × 0.85^(5) × (1 - 0.85)^(7 - 5)
P(5) = 0.2097
P(6) = C(7,6) × 0.85^(6) × (1 - 0.85)^(7 - 6)
P(6) = 0.3960
P(7) = C(7,7) × 0.85^(7) × (1 - 0.85)^(7 - 7)
P(5) = 0.3206
P(X > 4) = 0.2097 + 0.3960 + 0.3206
P(X > 4) = 0.9263 ≈ 0.93
I'm not too sure on this one
martin reads 19 pages of a novel in 12 minutes. complete the proportion and use it to find x, the number of pages he reads in 42 minutes
Answer:
67 pages in 42 minutes
Step-by-step explanation:
A person on a moving sidewalk travels 56 feet in 8 seconds. The moving sidewalk has a length of 210 feet. How long will it take to move from one end to the other?
**please help me **
Answer:
1470 seconds
Step-by-step explanation:
56=8 seconds
1 second= 56÷8=7
Ans=7×210=1470
Michonne's Phone Service charges $11.06 for an activation fee plus $4 for every gigabyte (g) used.
Answer:
Graph the line of y=11.06x+4
Step-by-step explanation:
First write the equation of the line you want to graph. In this case the values are 11.06 as m, and 4 as the y-intercept (b). If you substitute the values into y=mx+b. Then you need to graph it. Plot the y-intercept, then use rise/run to complete the rest of the points and the line.
What is the value of x in the equation 0.7x – 1.4 = –3.5?
–7
–3
3
7
Answer:
-3
Step-by-step explanation:
0.7x-1.4=-3.5
Add 1.4 to both sides:
0.7x=-2.1
Divide 0.7 from both sides:
x=-3
If the coefficient of determination for a data set containing 9 points is 1, how
many of the data points must lie on the regression line for the data set?
O A. 9
OB. 8
O C. 6
O D. 7
Answer: A
Step-by-step explanation:
The coefficient of determination is a number between 0 and 1 used to measure the level of precision with which the regression model created fits the data. A measure of means that the model explains the entire variation between the two variables without error.
Therefore, in this case, if means that the 9 points are on the line
Answer:
Therefore, in this case, it means that the 9 points are on the line
Step-by-step explanation:
A desk is 2 meters long and 1 meter wide. The desk needs to be represented in a scale drawing of an office that uses a scale of 1 centimeter = 0.5 meter. What are the dimensions of the desk in the drawing?
Answer:
Thus, the dimensions of the desk in the drawing are 4 cm long and 2 cm wide.
Step-by-step explanation:
Scaling
The scale factor established to represent a desk 2 meters long and 1 meter wide is:
1 centimeter = 0.5 meter
We need to convert the real dimensions to the scaled dimensions. To complete the task, it's a good idea to multiply the real dimensions by the ratio:
[tex]\displaystyle \frac{1\ cm}{0.5\ m}[/tex]
to get the scaled dimensions.
The length of 2 meters is scaled to:
[tex]\displaystyle 2\ m\frac{1\ cm}{0.5\ m}=4\ cm[/tex]
And the width of 1 meter is scaled to:
\displaystyle 1\ m\frac{1\ cm}{0.5\ m}=2 cm
Thus, the dimensions of the desk in the drawing are 4 cm long and 2 cm wide.
How many significant digits should the product of 11,435 m and 19.35 m have
Answer:
2 significants choes the least significant digets which is 19.35
result is 221,267.25
100 POINTS PLEASE HELP
Please be accurate with this too.
Answer:
The answer is A :)
Step-by-step explanation:
What do the angles of a triangle add up to? If 2 angles are 34 and 18, what is the third angle?
Answer:
The third angle is 128 degrees
Step-by-step explanation:
The interior angles of a triangle add up to 180 degrees, therefore we can set up the equation x+34+18=180 to find the missing angle. Solving the equation gets us x=128
Answer:
Angles of a triangle add up to 180 degrees. The third angle would be 128 degrees.
Step-by-step explanation:
34 + 18 = 52
180 - 52 = 128
PLEASE HELP: Tangent, Sine, or Cosine? Please only answer if you know I genuinely need help. WILL GIVE BRAINLIEST IF CORRECT
Answer:
cosine
Step-by-step explanation:
cos 27=x/20
x=20 cos 27≈17.82
Find the reciprocal of 7/12
What is the quotient when 10x^3-3x^2-7x+3 is divided by 2x-1?
Answer:
Step-by-step explanation:
STEP
1
:
Equation at the end of step 1
STEP
2
:
Equation at the end of step
2
:
STEP
3
:
10x3 - 3x2 - 7x + 3
Simplify ———————————————————
2x - 1
Checking for a perfect cube :
3.1 10x3 - 3x2 - 7x + 3 is not a perfect cube
Trying to factor by pulling out :
3.2 Factoring: 10x3 - 3x2 - 7x + 3
Thoughtfully split the expression at hand into groups, each group having two terms :
Group 1: -7x + 3
Group 2: 10x3 - 3x2
Pull out from each group separately :
Group 1: (-7x + 3) • (1) = (7x - 3) • (-1)
Group 2: (10x - 3) • (x2)
Bad news !! Factoring by pulling out fails :
The groups have no common factor and can not be added up to form a multiplication.
Polynomial Roots Calculator :
3.3 Find roots (zeroes) of : F(x) = 10x3 - 3x2 - 7x + 3
Polynomial Roots Calculator is a set of methods aimed at finding values of x for which F(x)=0
Rational Roots Test is one of the above mentioned tools. It would only find Rational Roots that is numbers x which can be expressed as the quotient of two integers
The Rational Root Theorem states that if a polynomial zeroes for a rational number P/Q then P is a factor of the Trailing Constant and Q is a factor of the Leading Coefficient
In this case, the Leading Coefficient is 10 and the Trailing Constant is 3.
The factor(s) are:
of the Leading Coefficient : 1,2 ,5 ,10
of the Trailing Constant : 1 ,3
Let us test ....
P Q P/Q F(P/Q) Divisor
-1 1 -1.00 -3.00
-1 2 -0.50 4.50
-1 5 -0.20 4.20
-1 10 -0.10 3.66
-3 1 -3.00 -273.00
-3 2 -1.50 -27.00
-3 5 -0.60 3.96
-3 10 -0.30 4.56
1 1 1.00 3.00
1 2 0.50 0.00 2x - 1
1 5 0.20 1.56
1 10 0.10 2.28
3 1 3.00 225.00
3 2 1.50 19.50
3 5 0.60 -0.12
3 10 0.30 0.90
The Factor Theorem states that if P/Q is root of a polynomial then this polynomial can be divided by q*x-p Note that q and p originate from P/Q reduced to its lowest terms
In our case this means that
10x3 - 3x2 - 7x + 3
can be divided with 2x - 1
Polynomial Long Division :
3.4 Polynomial Long Division
Dividing : 10x3 - 3x2 - 7x + 3
("Dividend")
By : 2x - 1 ("Divisor")
dividend 10x3 - 3x2 - 7x + 3
- divisor * 5x2 10x3 - 5x2
remainder 2x2 - 7x + 3
- divisor * x1 2x2 - x
remainder - 6x + 3
- divisor * -3x0 - 6x + 3
remainder 0
Quotient : 5x2+x-3 Remainder: 0
Trying to factor by splitting the middle term
3.5 Factoring 5x2+x-3
The first term is, 5x2 its coefficient is 5 .
The middle term is, +x its coefficient is 1 .
The last term, "the constant", is -3
Step-1 : Multiply the coefficient of the first term by the constant 5 • -3 = -15
Step-2 : Find two factors of -15 whose sum equals the coefficient of the middle term, which is 1 .
-15 + 1 = -14
-5 + 3 = -2
-3 + 5 = 2
-1 + 15 = 14
Observation : No two such factors can be found !!
Conclusion : Trinomial can not be factored
Canceling Out :
3.6 Cancel out (2x-1) which appears on both sides of the fraction line.
Final result :
5x2 + x - 3
The quotient when 10x³-3x²-7x+3 divided by 2x-1 is -21/8.
To calculate the quotient of the equation 10x³-3x²-7x+3 when it is divided by 2x-1, we use the quotient theorem.
Remainder theorem
The quotient theorem states that if f(x) is divided by x-a, then the remainder is f(a).
From the question,
Given:
f(x) = 10x³-3x²-7x+3............. Equation 1diveded by 2x-1The quotient is f(1/2), we substitute the value of x as 1/2 into equation 1
f(1/2) = 10(1/2)³-3(1/2)²-7(1/2)+3f(1/2) = (10/8)-(3/4)-(7/2)+3f(1/2) = -21/8Hence, The quotient when 10x³-3x²-7x+3 divided by 2x-1 is -21/8.
Learn more about the quotient theorem here: https://brainly.com/question/13328536
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An 8-pack of batteries costs $9.44
What is the price in dollars, of one battery?
Answer:
1.18
Step-by-step explanation:
First we have established that 9.44 is the total, and we know that there are 8 batteries in each pack. This is a problem of division.
By first identifying key words like each and total, you can safely assume it will be a division problem.
First step: Dividing the total with the number of batteries in the singular pack gives you a valid answer
9.44÷8=1.18
Second step: To make sure you didn't miscalculate, you can use: 1.18×8, which is equal to the total.
Ms. Drevis' garden has lots of apple trees. 120 apples fall on ground in 30 seconds. How many
apples fall in one second?
Answer:
the answer would be 4
Step-by-step explanation:
because 120 divided by 30 is 4
Answer:4 apples fall per second/ in one second
Step-by-step explanation:
4 x 30 = 120
120 / 30 = 4
Which expression is equivalent to (r^-7)^6?
Priya decomposed a square into 16 smaller, equal-size squares and then cut out 4 of the small squares and attached them around the outside of original square to make a new figure.
How does the area of her new figure compare with that of the original square?
The new square is smaller.
Please help me, thanks!
Answer:
Algebraic expression for 75 less than twice Mabel's score is 2m-75
Step-by-step explanation:
We need to translate the phrase 75 less than twice Mabel's score into algebraic expression.
Translating into algebraic expression
Let m represent Mabel's score
Twice Mabel's score = 2m
75 less than Twice Mabel's score = 2m-75
So, algebraic expression for 75 less than twice Mabel's score is 2m-75
The price of apples at three different stores in shown below.
Store R sells apples for $1.20 per pound
Store S sells 4 pounds of apples for $5.00
Store T sells 3 pounds of apples for $3.48
Which of these is a true statemen
Answer: None
Step-by-step explanation: You need more info to answer that question so I would just put that you don’t know much about the question.
Which describes the transformation shown below
A
B
C
D
Answer:
i think the answer is a to be honest
Step-by-step explanation:
How much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 80% antifreeze?
Answer:
The amount of water to be added is ¹/₄ gallon
Step-by-step explanation:
Given;
amount of pure antifreeze at 100% = 1 gallon
let the amount of water to be added with 0% antifreeze = (x) gallon
then, the amount of mixture at 80% antifreeze = (x + 1) gallon
For conservation of mass, we will have the following equation;
(1 x 1) + (0)(x) = 0.8(x +1)
1 = 0.8x + 0.8
0.8x = 1 - 0.8
0.8x = 0.2
x = 0.2 / 0.8
x = ²/₈
x = ¹/₄ gallon
Therefore, the amount of water to be added is ¹/₄ gallon
Helpppppppppppppppppppp
Answer:
Step-by-step explanation:
Instead of using the values {1,2,3,4,5,6}
on dice, suppose a pair of dice have the
following: {1,2,2,3,3,4} on one die and
{1,3,4,5,6,8} on the other. Find the
probability of rolling a sum of 7 with
these dice. Be sure to reduce.
?
]
Answer:
[tex]Probability(sum7)=\frac{4}{24}=\frac{1}{6}[/tex]
Step-by-step explanation:
The dice form pairs of outcomes, so if the dice has repeating sides then the set of outcomes will be pairs of elements from the set {1,2,3,4} and {1,3,4,5,6,8}. The number of possible two pair combinations is 4 times 6 which equals 24 possible pairs. Now we find which of these pairs would have values summing up to 7: [tex](1,6),(2,5),(3,4),(4,3)[/tex] So 4 outcomes out of a possible 24 outcomes have this qualityThat's [tex]Probability(sum7)=\frac{4}{24}=\frac{1}{6}[/tex]Answer:
1/6
Step-by-step explanation:
If p + 2q = 20, what is the value of 101p + 202q?
Answer:
bhvigjcgujj
Step-by-step explanation:
Please help its due at 11:05
Answer:
-2 or -3 or even -4
Any number from -9 to -1 would be greater than -10
Consider the reduction of the triangle.
A triangle has side lengths 10 centimeters, 85 centimeters, and 62 centimeters. A smaller triangle has side lengths A, B, 6.2 centimeters.
Use the measurements of the original figure and the scale drawing to calculate the scale factor and missing measures.
What is the scale factor? 1/10
What is the length of A? 1
What is the length of B? 8.5
Answer:
What is the scale factor? 1/10
What is the length of A? 1
What is the length of B? 8.5
Step-by-step explanation:
The scale factor and missing measures are 1/10, A = 1, B = 8.5
What is scale factors?A scale factor is defined as the ratio between the scale of a given original object and a new object, which is its representation but of a different size.
Given are measurements of two triangles, we need to find the missing sides and the scale factors,
So, the scale factor = new measurement / original measurement = 6.2/62 = 1/10
Now, using the definition of the similar triangles, the ratio of the corresponding sides are equal,
62/6.2 = 85/B
10 = 85 / B
B = 8.5
Now,
62/6.2 = 10/A
10 = 10/A
A = 1
Hence, the scale factor and missing measures are 1/10, A = 1, B = 8.5
Learn more about scale factors, click;
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Suppose that there are 327 members of a professional organization, of which 164 are over the age of 50. What is the probability that a randomly selected member of the organization is over the age of 50?
Answer:
0.502
Step-by-step explanation:
There are 327 members of a professional organization, of which 164 are over the age of 50.
The probability that a randomly selected member of the organization is over the age of 50 is calculated as:
Probabilty = 164 members/327 members
= 0.501529052
Approximately = 0.502
Therefore, the probability of the randomly selected member is over the age of 50 is 0.502.
The manager of the zoo where the ticket price for an adult is $9.50 and the ticket price for a child is $6.50 wants to make at least $800 on a Saturday. Let x be the number of adult tickets and y be the number of child tickets. Choose the inequality that shows the numbers of tickets that need to be sold.
Answer:
[tex]9.5x+6.5y\geq $800[/tex]
Step-by-step explanation:
9.5 in value of adult tickets. 6.5 is value of children's tickets. combined selling of all of them should be greater than or equal to 800 ("atleast" in the question shows it can be more but cannot be less)