In a study investigating the effect of car speed on accident severity, the vehicle speed at impact was recorded for 5,000 fatal accidents. For these accidents, the mean speed was 42 mph, and the standard deviation was 16 mph. A histogram revealed that the vehicle speed distribution was bell shaped and approximately symmetric. Approximately what percentage of vehicle speeds were between 10 and 58 mph?........ % of vehicle speeds were between 10 and 58 mph.