The mean life of a tire is 35,000 km. The standard deviation is 2000 km.
1. The mean life of a tire is 35,000 km. The standard deviation is 2000 km.
a) 68% of all tires will have a life between ________ km and ________ km.
b) 95% of all tires will have a life between ________km and ________km.
c) What percent of the tires will have a life that exceeds 26,000 km?
d) If a company purchased 2000 tires, how many tires would you expect to last more than 28 000 km?