Find the standard deviation and variance of each set of scor

Find the standard deviation and variance of each set of scores A,B, &C? (show all work)

(A) 3,5,7,9

(B) 0.2, 0.4, 0.6, 0.8

(C) 3.5, 6.2, 9.3, 4.1, 5.5, 7.9

Solution

Mean = sum of item/ number of items

Variance = sum (X-mu)^2 /number of items

mu-Mean