129 Quit-smoking program. According to the University of South Florida’s Tobacco Research and Intervention Program, only 5% of the nation’s cigarette smokers ever enter into a treatment program to help them quit smoking

( USF Magazine , Spring 2000). In a random sample of 200 smokers, let x be the number who enter into a treatment program.

a. Explain why x is a binomial random variable (to a reasonable degree of approximation).

b. What is the value of p ? Interpret this value.

c. What is the expected value of x ? Interpret this value.