A bus comes by every 12 minutes. The times from when a person arives at the busstop until the bus arrives follows a Uniform distribution from 0 to 12 minutes. A person arrives at the bus stop at a randomly selected time. Round to 4 decimal places where possible. a. The mean of this distribution is b. The standard deviation is c. The probability that the person will wait more than 9 minutes is d. Suppose that the person has already been waiting for 2.1 minutes. Find the probability that the person's total waiting time will be between 3.9 and 6.4 minutes

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