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The time required for an automotive center to complete an oil change service on an...

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The time required for an automotive center to complete an oil change service on an automobile approximately follows a normal distribution with a mean of 19 minutes and a standard deviation of 3 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 customers receive the service for half price b If the automotive center does not want to give the discount to more than 5 of its customers how long should it make the guaranteed time limit www a The percent of customers that receive the service for half price is Round to two decimal places as needed

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