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The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean=39 and standard deviation=4 Use the TI-84 Plus
The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean=39 and standard deviation=4 Use the TI-84 Plus calculator to answer the following.
(a) What is the probability that a randomly chosen tire has a lifetime greater than49
thousand miles?
(b) What proportion of tires have lifetimes between38and43thousand miles?
(c) What proportion of tires have lifetimes less than45 thousand miles?
Round the answers to at least four decimal places.
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