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A food delivery restaurant manager says that the time taken to deliver food to the customers is normally distributed with mean of 30 minutes and

A food delivery restaurant manager says that the time taken to deliver food to the customers is normally distributed with mean of 30 minutes and standard deviation of 2 minutes. If the food delivery time exceeds 40 minutes, a food voucher will be given to the customers. If 10% of all the food deliveries take less than A minutes, find the value of A.

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