Question 820317
The exam has 50 questions and each question has four multiple questions in which one of the choice is correct answer.
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Binomial Problem with n = 50 and p(correct) = 1/4
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If a student answers the entire question by guess , what is the chance that he /she will answer 
a. Half of the questions correctly?
P(x = 25) = 50C25*(1/4)^25(3/4)^25 = binompdf(50,1/4,25) = 0.0000845..
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b. ¾ of the questions correctly ?
P(x = 38) = binompdf(50,1/4,38) = 5.09..x10^-14
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c. The entire questions correctly
P(x = 50) = (1/4)^50 = 7.89..x10^-31
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Cheers,
Stan H.
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