1. Which of the following would have a binomial distribution?
A. A couple will have children until they have three girls or five children. X is the number of children in the family.
B. Max the magician (who practices flipping coins) will call flips of a coin in the air. X is the number of correct calls in 10 flips.
C. None of the others is binomial.
2. In a pre-election poll, 400 of the 500 probable voters polled favored the incumbent. In this poll, the sample proportion, p' , of those favoring the challenger is
A. 0.80.
B. 0.20.
C. 0.50.
3. The binomial coefficient, written 
, gives what information?
A. the probability of obtaining k successes in n trials
B. the number of ways in which one can obtain k successes in n trials
C. the chance of observing a success