Marc is waiting for a tram. If X is the amount of time before the next tram arrives, and X is uniform with values between 6 and 18 minutes, then what is the average (mean) time and the approximate standard deviation for how long he will wait? Select the correct answer below: Mean is 14 minutes; standard deviation is 12.0 minutes Mean is 12 minutes; standard deviation is 12.0 minutes Mean is 14 minutes; standard deviation is 3.5 minutes Mean is 12 minutes; standard deviation is 3.5 minutes Mean is 14 minutes; standard deviation is 2.4 minutes

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