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Automotive center guarantees customers

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The time required for an automotive center to complete an oil change service on an automotive approximately follows a normal distribution, with a mean of 19 minutes and a standard deviation of 2.5 minutes.

a. The automotive center guarantees customers that the service will take no longer than 20 minutes. If it does take longer, the customer will receive the service for half-price. What percent of customer receive the service for half-price?

b. If the automotive center does not want to give the discount to more than 7% of its customer, how long should it make the guaranteed time limit?

Reference no: EM13845054

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