For which of the following counts would a binomial probability model be reasonable?

Question

Quizplus · Accepted Answer

A binomial probability model is reasonable when there are a fixed number of trials, each trial has only two possible outcomes (success or failure), the probability of success is the same for each trial, and the trials are independent. Choice C, the number of individuals who take a cholesterol-lowering drug in a random sample of 100 medical records, fits these criteria, as it involves a fixed number of trials (100 medical records), each with two outcomes (taking or not taking the drug), presumably with the same probability of success (taking the drug), and the trials (medical records) can be considered independent. Choices A and B involve counts that may not have a fixed number of trials or clearly defined probabilities of success for each trial, and the independence of trials may be questionable.

For Which of the Following Counts Would a Binomial Probability