breyaself breyaself

22-03-2018
Mathematics

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

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sqdancefan sqdancefan

22-03-2018

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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