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Question regarding the normal distribution with a mean

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The time it takes a student to walk from the dorm to the chemistry lab follows approximately a normal distribution with a mean of 20 minutes and a standard deviation of 3 minutes. If you are waiting at the chemistry lab for your friend to come to you walking from the dorm, that friend promised you that he will be there in no more than 15 minutes. What is the probability that he will arrive as promised by 15 minutes?

Reference no: EM131098110

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