Asked by Harry
A quiz has 20 multiple choice questions, each with a choice of 4 answers. If Jay guesses an answer for each question at random, find the probability that he will score 75% on this quiz, correct to 2 significant figures.
Answer: 0.000 003 4
Thanks for any help
Answer: 0.000 003 4
Thanks for any help
Answers
Answered by
R_scott
this is a binomial probability
... p(correct) = .25
... p(wrong) = .75
(c + w)^20
p(75% correct) = 20C5 * .25^15 * .75^5
... p(correct) = .25
... p(wrong) = .75
(c + w)^20
p(75% correct) = 20C5 * .25^15 * .75^5
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