A survey of U.S. adults found that 51% think that high school students should be required to learn a foreign language. You randomly select 200 adults and ask them whether they think high school students should be required to learn a foreign language. Find the probability that the number who say yes is
(a) At least 120,
(b) At most 80,
(c) Between 80 and 120,
(d) Identify any unusual events.
Explain.