Which one of these variables is a binomial random variable?
A) Time it takes a randomly selected student to complete a multiple choice exam.
B) Number of textbooks a randomly selected student bought this term.
C) Number of women taller than 68 inches in a random sample of 5 women.
D) Number of CDs a randomly selected person owns.

Question

Quizplus · Accepted Answer

A binomial random variable is defined by two outcomes (success or failure) in a fixed number of trials. In choice C, the number of women taller than 68 inches in a random sample of 5 women fits this definition, where each trial (each woman's height) has two outcomes (taller than 68 inches or not) and there is a fixed number of trials (5 women).

Which One of These Variables Is a Binomial Random Variable