The passenger car tires manufactured by Greatyear Co.  last on average  66,200   μ = 66,200   Of all tires manufactured by Greatyear  15%  last more than  74,800  miles.   Greatyear is considering a guarantee that will provide a discount on replacement tires if the original tires do not reach the guaranteed mileage.     What should the guaranteed mileage be if Greatyear wants no more than (at most)  5% of the tires be eligible for the discount guarantee?           a 45,056 b 47,428 c 49,924 d 52,552

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