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) all of the above
D) none of the above

Question

Quizplus · Accepted Answer

A binomial distribution can be used in this scenario because there are a fixed number of independent trials (answering each question) with only two possible outcomes (getting the question right or wrong), and the probability of success (getting the question right) is the same for each trial (1/4).

A Multiple-Choice Test Has 30 Questions