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The time it takes to process phone orders in a store is normally distributed, where the mean is unknown, but the standard deviation is 5.4

The time it takes to process phone orders in a store is normally distributed, where the mean is unknown, but the standard deviation is 5.4 minutes.What is the value of the mean, if you are told that 18.7 minutes is the lowest value in the top 2.5% of phone order processing times?

Please give your answer correctly rounded to two decimal places.

Do not include units in your answer.

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