Suppose 73% of Americans watch at least 28 hours of TV each…

Suppose 73% of Americans watch at least 28 hours of TV each week. A random sample of 20 Americans was selected. (Round to 3 decimal places.)   a. Find the probability that exactly 18 of those sampled watch at least 28 hours of TV each week. [a] b. Find the probability that more than 17 of those sampled watch at least 28 hours of TV each week. [b] c. Find the expected number of Americans that watch at least 28 hours of TV each week. [c]