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what is the probability of getting 16 out of 20 questions correct on a true/false test?

 Apr 5, 2018
 #1
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what is the probability of getting 16 out of 20 questions correct on a true/false test?

 

20C16*0.5^20 

 

nCr(20,16)*(1/2)^20 = 0.0046205520629883 = 0.46%

 

That is assuming that you totally guess every single answer.

 Apr 5, 2018
 #2
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20! / [16! x 4! x 2^20] = 0.00462 x 100 =o.462%

 Apr 5, 2018

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