74. Consider the following data on active repair time

(hours) for a sample of n  46 airborne communications receivers:

.2 .3 .5 .5 .5 .6 .6 .7 .7 .7 .8 .8

.8 1.0 1.0 1.0 1.0 1.1 1.3 1.5 1.5 1.5 1.5 2.0 2.0 2.2 2.5 2.7 3.0 3.0 3.3 3.3 4.0 4.0 4.5 4.7 5.0 5.4 5.4 7.0 7.5 8.8 9.0 10.3 22.0 24.5 Construct the following:

a. A stem-and-leaf display in which the two largest values are displayed separately in a row labeled HI.

b. A histogram based on six class intervals with 0 as the lower limit of the rst interval and interval widths of 2, 2, 2, 4, 10, and 10, respectively.