You have a 5-question multiple-choice test. Each question has four choices. You don’t know any of th

Algebra
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You have a 5-question multiple-choice test. Each question has four choices. You don’t know any of the answers. What is the experimental probability that you will guess exactly three out of five questions correctly?

 
Apr 29th, 2015

Binomial Problem with n = 5 and p(correct) = 1/4

P(x = 3) = 5C3(1/4)^3*(3/4)^2 = binompdf(5,1/4,3) = 0.0879


Apr 29th, 2015

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