How long does it take to download a two-hour movie from the iTunes store? According to Apple's technical support site, downloading such a movie using a 5 Mbit/s broadband connection should take 18 to 24 minutes. Assume that the download times are uniformly distributed between 18 to 24 minutes. Also assume you use a 5 Mbit/s broadband connection.

If you download a two-hour movie, what is the probability that the download time will be less than 20 minutes?

a.0.7917

b.0.5281

c.0.3333

d.0.2639