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
2 answers
95% should include -2 to + 2 standard deviation.
A
95% is 2 SDs away from 0. 120-110=10 so that is 2 SDs. 10/2=5 which would be 1 SD.
95% is 2 SDs away from 0. 120-110=10 so that is 2 SDs. 10/2=5 which would be 1 SD.
0 answers