Use the formula to find the variance and the standard deviation for the given sample data....
Homework Answers
Given data - X :- 7,9,12,5,8
Mean = sum / n = 41 / 5 = 8.2
(Xi - mean )² = 1.44, 0.64, 14.44, 10.24, 0.04
SSdif = sum(Xi-mean)² = 26.8
Sample variance = SSdif / n-1 = 26.8/4 = 6.7
Sample standard deviation = sqrt ( variance ) = sqrt(6.7) = 2.588 ~ 2.6
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