A multiple-choice test has 30 questions. There are 4 choices for each question. A student who has not studied for the test decides to answer all questions randomly. What type of probability
Distribution can be used to figure out his chance of getting at least 20 questions right?
A) binomial distribution.
B) Poisson distribution.
C) hypergeometric distribution.
D) none of the above.

Question

Quizplus · Accepted Answer

A binomial distribution is appropriate here because each question has two possible outcomes (correct or incorrect), there are a fixed number of questions (30), and the probability of getting a question right is constant (1/4).

A Multiple-Choice Test Has 30 Questions