Question

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?
○ 1.5
○ 2.7
○ 3.0
○ 3.8

Explanation:

Step1: Use mean - lower bound

$\text{Standard Deviation} = 7.5 - 6$

Step2: Calculate the difference

$\text{Standard Deviation} = 1.5$
(Verify with upper bound: $9 - 7.5 = 1.5$, same result)

Answer:

1.5