7. Following are the speeds of 25 cars clocked by radar on the freeway: 96, 83, 59, 64, 73, 74, 80, 68, 87, 67, 64, 92, 76, 71, 68, 50, 85, 75, 81, 70, 76,
91, 69, 83, 75.
a. Construct a grouped frequency distribution, a relative frequency
distribution (proportion), and a cumulative relative frequency
distribution (including percentile rank).
b. Draw a histogram of the data.
6. Describe the approximate shape of the distribution.