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The tread life of Road Stone tires has a normal distribution with a mean of 35,000...

The tread life of Road Stone tires has a normal distribution with a mean of 35,000 miles and a standard deviation of 4,000 miles.

a. What proportion of these tires has a tread life of more than 38,000 miles?

b. What proportion of these tires has a tread life of less than 32,000 miles?

c. What proportion of these tires has a tread life of between 32,000 and 38,000 miles?

Math   Statistics-And-Probability   
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