In a study investigating the effect of car speed on accident severity, 5000 reports of fatal automobile accidents were examined, and the vehicle speed at impact was recorded for each one. For these 5000 accidents, the average speed was 42 mph and the standard deviation was 15 mph. A histogram revealed that the vehicle speed at impact distribution was approximately normal.          a. Approximately what proportion of these vehicle speeds were                  between 27 and 57 mph? (Hint: See Example 4.17.)                                      b. Approximately what proportion of these vehicle speeds                           exceeded 57 mph?

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