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Mathematics, 18.02.2021 22:50 Hazard970

You are awaiting your tax return and the time at which the mailman delivers the mail to your home follows a normal distribution with a mean time of 840 minutes into the day (2:00pm) and a standard deviation of 15 minutes. What is the probability the mail will arrive between 828 minutes into the day (1:48pm) and 870 minutes into the day (2:30pm)

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