A set of 10 scores has a sum of squares value of 810. What is the standard deviation?
A) 8100
B) 81
C) 9
D) 90

Question

Quizplus · Accepted Answer

The formula for calculating the standard deviation is:

Standard deviation = √(sum of squares of deviations / number of scores)

Since the question provides the sum of squares value, we can use this formula to solve for the standard deviation:

√(810/10) = √81 = 9

Therefore, the standard deviation is 9, which corresponds to choice (C).

A Set of 10 Scores Has a Sum of Squares