According to a Gallup Poll conducted March 5-7,2001, 52% of American adults think that protecting the environment should be given priority over developing U.S. energy supplies. Thirty-six percent think that developing energy supplies is more important, and 6% believe the two are equally important. The rest had no opinion. Suppose that a sample of 100 American adults is quizzed on the subject. What is the probability of the following events?

a. Fifty or more think that protecting the environment should be given priority.
b. Thirty or fewer think that developing energy supplies is more important.

c. Five or fewer have no opinion.