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Suppose that the time required to complete 1040R tax form is normal distributed with a mean of 100 minutes and a standard deviation of 10

Suppose that the time required to complete 1040R tax form is normal distributed with a mean of 100 minutes and a standard deviation of 10 minutes. What proportion of 1040R tax forms will be completed in at most 81 minutes? Round your answer to at least four decimal places.

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