The following data represent the lifetimes (in hours) of a sample of 40 transistors:
112, 121, 126, 108, 141, 104, 136, 134
121, 118, 143, 116, 108, 122, 127, 140
113, 117, 126, 130, 134, 120, 131, 133
118, 125, 151, 147, 137, 140, 132, 119
110, 124, 132, 152, 135, 130, 136, 128
(a) Determine the sample mean, median, and mode.
(b) Give a cumulative relative frequency plot of these data.