Question: When a motorist stops at a red light at a certain intersection, the waiting time for the light to turn green, in seconds, is uniformly

When a motorist stops at a red light at a certain intersection, the waiting time for the light to turn green, in seconds, is uniformly distributed on the interval (0, 90).

a) Find the mean waiting time and standard deviation?

b) Find the probability that the waiting time is between 20 and 35 seconds.

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