Question: An e-mail message will arrive at a time uniformly distributed between 9:00 a.m. and 11:00 a.m. You check e-mail at 9:15 a.m. and every 30

An e-mail message will arrive at a time uniformly distributed between 9:00 a.m. and 11:00 a.m. You check e-mail at 9:15 a.m. and every 30 minutes afterward.

(a) What is the standard deviation of arrival time (in minutes)?

(b) What is the probability that the message arrives less than 10 minutes before you view it?

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