Question: Suppose commute times in a large city are normally distributed and that 62.5% of commuters in this city take more than 21 minutes to commute

Suppose commute times in a large city are normally distributed and that 62.5% of commuters in this city take more than 21 minutes to commute one-way. If the standard deviation of such commutes is 6.2 minutes, what is the mean commute?

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