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11 June, 17:21

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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  1. 11 June, 19:30
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    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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