Find the mean, median, and mode/modes of the following set of data

a. 35,54, 48, 61,97
b. 40, 38, 29, 34, 37, 22, 15, 38
c. 26, 32, 12, 18, 11, `8, 21, 12, 27
d. 3, 3, 4, 7, 6, 7, 8, 8, 8, 9, 8, 10, 12, 9 15, 15