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4. From long experience, it is known that the time it takes to do an oil change and lubrication job on a car has a normal distribution with mean = 17.8 minutes and standard deviation = 5.2 minutes. An auto service shop will give a free lube job to any customer who must wait beyond the guaranteed time to complete the work. If the shop does not want to give more than 1% of its customers a free lube job, how long should the guarantee be (rounded to the nearest minute)?