Asked by Mm

IQs among undergraduates at Mountain Tech are approximately normally distributed. The mean undergraduate IQ is 110. About 95% of undergraduates have IQs between 100 and 120. The standard deviation of these IQs is about

A. 5

B. 10

C. 15

D. 20

E. 25
Answered by Dr. Jane
95% should include -2 to + 2 standard deviation.
Answered by Cora
A
95% is 2 SDs away from 0. 120-110=10 so that is 2 SDs. 10/2=5 which would be 1 SD.
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