Question

04.05

The mean shoe size of the students in a math class is 7.5.
Most of the shoe sizes fall within 1 standard deviation, or
between a size 6 and a size 9.
What is the standard deviation of the shoe size data for the
math class?
O 1.5
O 27
O 3.0
O 3.8
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Answer 1

(A) 1.5

Explanation:

took test :)

Answer 2

The formula of standard deviation is

SD = square root of (variance)

Variance is the average of the squared differences from the Mean.

Variance = (6-7.5)^2 + (9-7.5)^2 / 2

Variance = 2.25

SD = square root (2.25)

SD = 1.5

The correct answer is A. 1.5