How long does it take to download a game for your iPod? According to Apple's technical support

Question:

How long does it take to download a game for your iPod? According to Apple's technical support site, support.apple.com/kb/htl577, downloading an iPod game using a 5 Mbit/s broadband connection should take 30 to 70 seconds. Assume that the download times are uniformly distributed between 30 and 70 seconds. If you download a game, what is the probability that the download time will be
a. Less than 34 seconds?
b. Less than 40 seconds?
c. Between 40 and 50 seconds?
d. What are the mean and standard deviation of the download times?