the following are the grades of 50 students in an exam:
33, 49, 81, 58, 59, 71, 42, 88, 68
54, 32, 50, 59, 41, 55, 38, 56, 86
50, 69, 23, 84, 77, 33, 71, 42, 69
61, 51, 46,76, 63, 96, 26, 70, 66
44, 52, 50, 33, 58, 39, 61, 71, 48
91, 62, 93, 80, 66.
(a) using 11 class intervals, construct a suitable table for this data
(b) use your table to construct a histogram
