O & webassign.net + Katsugeki TOUKEN RANBU The First Unit - Watch on C.. Homework #7 (Chapter 4, Section 4) - AMAT 108 (MW.. My Overview | Chegg.com Sign In - Google Accounts Less than 16 min? % Viewing Saved Work Revert to Last Response 3. [-/1.11 Points] DETAILS MY NOTES ASK YOUR TEACHER In a study Investigating the effect of car speed on accident severity, 5,000 reports of fatal automobile accidents were examined, and the vehicle speed at Impact was recorded for each one. For these 5,000 accidents, the average speed was 47 mph and the standard deviation was 14 mph. A histogram revealed that the vehicle speed at impact distribution was approximately normal. (Use the Empirical Rule.) (a) Approximately what percentage of vehicle speeds were between 33 and 61 mph? approximately % (b) Approximately what percentage of vehicle speeds exceeded 61 mph? (Round your answer to the nearest whole number.) approximately 4. [-/1.11 Points] DETAILS MY NOTES ASK YOUR TEACHER The mean lifetime of a certain tire is 43,000 miles and the standard deviation is 4000 miles. (Give your answers correct to one decimal place.) (a) If we assume the mileages are normally distributed, then approximately what percentage of all such tires will last between 35,000 and 51,000 miles? % (b) If we assume nothing about the shape of the distribution, then at least what percentage of all such tires will last between 35,000 and 51,000 miles? % [1.11/1.11 Points] DETAILS PREVIOUS ANSWERS MY NOTES ASK YOUR TEACHER MacBook Air 80 Q FO DD