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

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? 

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