# John received a score of 75 on a math test where the mean was 50. If his score is 2.5 standard deviations away from the mean, what is the variance of the classes test scores?

##### 1 Answer

Nov 5, 2015

Standard deviation is defined as the square root of the variance.

(so variance is standard deviation squared)

#### Explanation:

In John's case he is 25 away from the mean, which translates to 2.5 times the standard deviation