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

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Guest
Dec 11, 2017