It has been reported the mean driving speed in California is 70 mph and the variance is 9.What is the SD?
A)9
B)3
C)8.5
D)None of these

Name: It has been reported the mean driving speed in California is 70 mph and the variance is 9.What is the SD? A)9 B)3 C)8.5 D)None of these
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Question

Quizplus · Accepted Answer

The standard deviation (SD) is the square root of the variance. Therefore,

SD = sqrt(9)

SD = 3

Hence, the best choice is B, with an SD of 3, which is the square root of the given variance of 9.

It Has Been Reported the Mean Driving Speed in California