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 US energy supplies, 36% think developing energy supplies is more important, and 6% believe the two are equally important. The rest have no opinion. Suppose that a sample of 100 American adults is quizzed on the subject. What is the probability of the following events?
a) 50 or more think protecting the environment should be given priority
b) 30 or fewer think that developing energy supplies is more important
c) 5 or fewer have no opinion