In: Statistics and Probability
In a study investigating the effect of car speed on accident
severity, the vehicle speed at...
In a study investigating the effect of car speed on accident
severity, the vehicle speed at impact was recorded for 5000 fatal
accidents. For these accidents, the mean speed was 42 miles per
hour with a standard deviation of 15 miles per hour. Assuming the
speeds are normally distributed, use the empirical rule to answer
the following:
a) About what percent of vehicle speeds were between 42 and 72
miles per hour?
b) About what percent of vehicle speeds were in excess of 57
miles per hour?
c) About what percent of vehicle speeds were below 12 miles
per hour?
d) About what percent of vehicle speeds were between 12 miles
per hour and 57 miles per hour?