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probability of guessing four correct out 20 multiple choices

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If a student randomly guesses at 20 multiple-choice questions, what is the probability that the student gets exactly four correct? Each question has four possible choices. (Enter your answer in decimal format. Answer should have two decimal positions.)

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Solution Summary

The solution explains how to calculate the probability of guessing four correct out 20 multiple choices, which follows a binomial distribution.

Solution Preview

Let X be the number of correct answers. X has the binomial distribution with n = 20 trials and success probability p = 0.25 (1 out 4 possible choices ...

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