At a large university, the graduation rate for student athletes was reported to be 0.61. For two of the following, we cannot use this chapter's methods to find the probability in question; explain why in each case.
a. The probability that fewer than 3 in a random sample of 6 athletes at the university graduate.
b. The probability that fewer than 10 in a random sample of 29 athletes at the university graduate.
c. The probability that fewer than 10 in a random sample of 29 football players at the university graduate.