# The mean life of a tire is 35,000 km. The standard deviation is 2000 km.

**Question description**

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?

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