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A multiple-choice test has 6 questions. Each question has 5 choices and only one of which is correct. If a student guesses the answer for each question find the probability that the students gets: exactly questions correct.

 

 

C(6,3) (.20)^3 * (.80)^3   = .08192  ≈  8.2%

Guest Dec 11, 2017
edited by Guest  Dec 11, 2017
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Your answer is the correct solution to the problems of getting exactly 3 questions correct.

geno3141  Dec 11, 2017

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