What is the variance of these three scores: 1, 4, 7?
A)3
B)4
C)6
D)9

Name: What is the variance of these three scores: 1, 4, 7? A)3 B)4 C)6 D)9
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Question

Quizplus · Accepted Answer

1. Find the mean: (1+4+7)/3 = 4
2. Subtract the mean from each score: 1-4 = -3; 4-4 = 0; 7-4 = 3
3. Square each of these differences: (-3)^2 = 9; 0^2 = 0; 3^2 = 9
4. Find the mean of these squared differences: (9+0+9)/3 = 6
Therefore, the variance is 6.

What Is the Variance of These Three Scores: 1, 4