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
