Sixty-three percent of U.S. teenagers say that they use Instagram daily. You randomly select seven U.S. teenagers. Find the probability that the number of U.S. teenagers who say that they use Instagram daily is 

(a) Exactly two 

(b) More than three, and 

(c) Between one and four, inclusive

Find the indicated probabilities using the geometric distribution, the Poisson distribution, or the binomial distribution. Then determine whether the events are unusual. If convenient, use a table or technology to find the probabilities.