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 17 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 (b) If the automotive center does not want to give the discount to more than \( 2 \% \) of its customers, how long should it make the guaranteed time limit? (a) The percent of customers that receive the service for half-price is (Round to two decimal places as needed.)
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