Suppose that car mufflers last random times that are
Chapter , Problem 17(choose chapter or problem)
Suppose that car mufflers last random times that are normally distributed with mean 3 years and standard deviation 1 year. If a certain family buys two new cars at the same time, what is the probability that (a) they should change the muffler of one car at least 11 2 years before the muffler of the other car; (b) one car does not need a new muffler for a period during which the other car needs two new mufflers?
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