Question

Problem 2: (9 pts) A survey on road safety done by one of the students at Vaughn College last year reported the relative speed, rounded to the nearest 5 mph, of cars involved in accidents. The percentages at different speeds were: 20mph or less 2.0% 25 or 30 mph 35 or 40 mplh 45 or 50 mph 55 mph 19.2% 60 or 65 mph 29.7% 30.4% 16.5% 2.2% (a) From these data, can we conclude that it is safe to drive at high speeds? Why or why not? (b) Why do most accidents occur in the 35 or 40 mph and in the 25 or 30 mph ranges? (c) Construct a density histogram using the end- points 0, 22.5, 32.5,42.5, 52.5, 57.5, 67.5 for the intervals.

Answer 1

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