The National Highway Traffic Safety Administration reported the relative speed (rounded to the nearest $5 mathrm{mph}$ )
Question:
The National Highway Traffic Safety Administration reported the relative speed (rounded to the nearest $5 \mathrm{mph}$ ) of automobiles involved in accidents one year. The percentages at different speeds were
$20 \mathrm{mph}$ or less | $2.0 %$ |
---|---|
25 or $30 \mathrm{mph}$ | $29.7 %$ |
35 or $40 \mathrm{mph}$ | $30.4 %$ |
45 or $50 \mathrm{mph}$ | $16.5 %$ |
$55 \mathrm{mph}$ | $19.2 %$ |
60 or $65 \mathrm{mph}$ | $2.2 %$ |
(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 $40 \mathrm{mph}$ and in the 25 or $30 \mathrm{mph}$ ranges?
(c) Construct a density histogram using the endpoints $0,22.5,32.5,42.5,52.5,57.5,67.5$ for the intervals.
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Related Book For
Probability And Statistics For Engineers
ISBN: 9780134435688
9th Global Edition
Authors: Richard Johnson, Irwin Miller, John Freund
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