Tire lifetimes: The lifetime of a certain type of automobile tire (in thousands of miles) is normally distributed with mean 39 and a standard deviation @= 5. (a) Find the 13 percentile of tire lifetimes. (b) Find the 65th percentile of tire lifetimes. (c) Find the first quartile of the tire lifetimes. (d) The tire company wants to guarantee that its tires will last at least a certain number of miles. What number of miles (in thousands) should the company guarantee so that only 4% of the tires violate the guarantee? Round answers to two decimal places. Part 1 of 4 The 13th Part 2 of 4 percentile of the tire lifétimes is The 65th percentile of the tire lifetimes is Part 3 of 4 The first quartile of the tire lifetimes is Part 4 of 4 The company should guarantee thousand miles. thousand miles. thousand miles. thousand miles. X X X

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