You are given a 12 question multiple choice quiz what is the probability that you will answer exactly 8 of the correctly by guessing assume that each question has 4 options

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asked May 5, 2019 63.0k views

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Andres Bores · Answer 1 · 2019-05-11T10:24:16+0000

probability of correct answer = 1/4

probability of a wrong answer = 3/4

probability of answering 8 out of 12 correctly:
12C8 * (1/4)^8 * (3/4)^4 =
12C8 = 495

495 x (1/4)^8 x (3/4)^4 = 0.00239

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You are given a 12 question multiple choice quiz what is the probability that you will answer exactly 8 of the correctly by guessing assume that each question has 4 options

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