Standard deviation and variance for a sample Consider a sample containing the following values: Subject Scores A 38 B 54 C 53 D 62 E 51 F 50 G 56 Calculate the mean for this sample. X = 52 Complete the following table. Subject Scores X - X (X - X ) 2 A 38 -14 196 B 54 2 4 C 53 1 1 D 62 10 100 E 51 -1 1 F 50 -2 4 G 56 4 16 Calculate the variance and standard deviation for this sample. s2 = 53.667 s = 7.3