54 Tires A Tire Manufacturer Believes That The Treadlife Of Its Snow Tires Can Be Described By A Normal Model With A Me 1 (24.45 KiB) Viewed 22 times
54. Tires A tire manufacturer believes that the treadlife of its snow tires can be described by a Normal model with a mean of 32,000 miles and standard deviation of 2500 miles.
Estimate the IQR of the treadlives. In planning a marketing strategy, a local tire dealer wants to offer a refund to any customer whose tires fail to last a certain number of miles. However, the dealer does not want to take too big a risk. If the dealer is willing to give refunds to no more than 1 of every 25 customers, for what mileage can he guarantee these tires to last?
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