The following list of test scores has an average of 50 and an SD of 10:

39 41 47 58 65 37 37 49 56 59 62 36 48 52 64 29 44 47 49 52 53 54 72 50 50

(a) Use the normal approximation to estimate the number of scores within 1.25 SDs of the average.

(b) How many scores really were within 1.25 SDs of the average? p-968