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OpenStudy (anonymous):
Between 7:00 AM and 8:00 AM, trains arrive at a subway station at a rate of 12 trains per hour (0.2 trains per minute). The following formula from statistics can be used to determine the probability that a train will arrive within t minutes of 7:00 AM. F(t)=1-e^-0.2t. Determine how many minutes are needed for the probability to reach 60%.
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