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the lifetime of a certain type of automobile tire (in thousands of miles)is normally distributed with...

the lifetime of a certain type of automobile tire (in thousands of miles)is normally distributed with a mean of 39 and a standard deviation of 4.
a. find the 24th percentile of tire lifetimes
b. find the 76th percentile of tire lifetimes
c.find the 3rd quartile of the tire lifetimes
d.what number of miles in thousands should the company guarantee so that only 3% of the tire violatethe guarantee
round answers to two decimal places

math   Statistics-And-Probability   
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