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11 January, 06:31

Estimated probability of guessing correctly on more than 3 out of 5 true-false questions

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  1. 11 January, 08:48
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    The probability of guessing 4 right is

    ... (5C4) * (1/2) ^5 = 5/32

    The probability of guessing 5 right is

    ... (5C5) * (1/2) ^5 = 1/32

    So, the probability of guessing 4 or 5 right is

    ... (5+1) / 32 = 6/32 = 0.1875
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