In 2006, the average combined SAT score (reading + verbal + writing) for college-bound students in the United States was 1518 (out of 2400). Suppose that approximately 45% of all high school graduates took this test, and that 100 high school graduates are randomly selected from throughout the United States. Which of the following random variables has an approximate binomial distribution? If possible, give the values for n and p.

a. The number of students who took the SAT

b. The scores of the 100 students on the SAT

c. The number of students who scored above average on the SAT

d. The amount of time it took each student to complete the SAT