Based on the data set, the variance for this sample of tests is 4
<h3>How to find the variance for this sample of tests?</h3>
The sample of test is given as:
78, 79, 79, 81, and 83.
Calculate the mean, using:
Mean = Sum/Count
So, we have
Mean = (78 + 79 + 79 + 81 + 83)/5
Evaluate
Mean = 80
The variance is calculated as

This gives
= [(78 - 80)^2 + (79 - 80)^2 + (79- 80)^2 + (81- 80)^2 + (83- 80)^2)]/[5 - 1]
Evaluate the numerator and the denominator.
So, we have:
=16/4
Evaluate the quotient
= 4
Hence, the variance for this sample of tests is 4
Read more about variance at:
brainly.com/question/15858152
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Answer:
D semi-sphere with diameter 10
Step-by-step explanation:
Rotating this along line m will give us a semi-sphere with diameter 10 ( radius 5)
It will be half of a ball
Answer:
h (-5) = 41/4 or 10.25
h (-2) = -3
h (3) = 25/4 or 6.25
Step-by-step explanation:
h (-5) = 1/4(-5)^2 + 4
h (-5) = 1/4(25) + 4
h (-5) = 41/4 or 10.25
h (-2) = -3 (this is given to you in the function)
h (3) = 1/4 (3)^2 + 4
h (3) = 1/4(9) + 4
h (3) = 25/4 or 6.25
Answer:
1/3
Step-by-step explanation:
The number of people over 40 is 20 + 30 + 35 = 85.
So the probability is 85/255, which reduces to 1/3.
Answer:
25%
Step-by-step explanation:
Got it right on khan