Question

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%.

Answer 1

Instead of using the formula given, I am trying to use formula, of
Y=C^(k)(x) / Y is the output, C is the initial, K is the % and x is the time, I just don't understand what it is saying to put it all together.