1. The amount of time a tire lasts is normally distributed witha mean of 30,000 km and standard
deviation of 2000 km.
(a) 68% of all tires will last between ____________ km and_____________ km.
(b) 95% of all tires will last between ____________ km and_____________ km.
(c) What percent of the tires will have a life that exceeds 26,000km? _________
(d) What percent of the tires will have a life that lasts between28,000 and 34,000 km? ______
(e) If a company purchases 2000 tires, how many tires are expectedto last
ï‚· more than 28,000 km? ___________
ï‚· between 24,000 and 32,000 km? ____________
