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Mathematics 18 Online
OpenStudy (anonymous):

Solve the problem. Between 7:00 AM and 8:00 AM, trains arrive at a subway station at a rate of 15 trains per hour 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-0.25t Determine how many minutes are needed for the probability to reach 20%.

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