What is the variance for the following set of scores: 20,24,26,22,18,16,18?
A)12.95
B)3.60
C)6.55
D)24

Question

Quizplus · Accepted Answer

The variance of a set of scores is calculated by finding the mean (average) of the scores, subtracting the mean from each score to find the deviations, squaring each deviation, finding the average of these squared deviations, and finally, if dealing with a sample rather than an entire population, adjusting the calculation accordingly. For this set of scores, the mean is 20.57. The squared deviations from the mean sum up to 90.86, and dividing this by the number of scores (7) gives a variance of approximately 12.95.

What Is the Variance for the Following Set of Scores