A history professor gives a quiz to his class and records the following scores: 13, 11, 11, 9, 12, 13, 16, 14, 11, 10, 8, 13, 20 . The standard deviation for this distribution is _________. Assume sample scores.
A) 3.12
B) 3.00
C) 13.26
D) 12.74

Question

Quizplus · Accepted Answer

The standard deviation is calculated by finding the square root of the variance. First, find the mean (average) of the scores, then calculate the variance by finding the average of the squared differences from the Mean, and finally, take the square root of the variance to get the standard deviation. The calculation based on the given scores results in a standard deviation of approximately 3.12, making option A correct.

A History Professor Gives a Quiz to His Class and Records