What is the variance of these four scores: 0, 1, 1, 2?
A).25
B).5
C).86
D)1

Question

Quizplus · Accepted Answer

The variance is calculated by finding the mean of the scores, subtracting the mean from each score, squaring the results, finding the average of those squared differences, and finally, because this is a sample variance, dividing by N-1 (where N is the number of scores). The mean of 0, 1, 1, 2 is 1. The squared differences from the mean are 1, 0, 0, 1. The average of these squared differences is 0.5, which is the variance.

What Is the Variance of These Four Scores: 0, 1