Charlie was looking at the variability of his data. The range for his sample was 150. The variance for his sample was 49. What is the standard deviation for the sample?
A) 7
B) 9
C) 101
D) There is not enough information to tell.

Question

Quizplus · Accepted Answer

The standard deviation is the square root of the variance. Since the variance is 49, the standard deviation is √49 = 7.

Charlie Was Looking at the Variability of His Data