SOLUTION: A student takes a true-false test consisting of 13 questions. Assuming that the student guesses at each question, find the probability that the student answers exactly 11 questions
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Question 286162: A student takes a true-false test consisting of 13 questions. Assuming that the student guesses at each question, find the probability that the student answers exactly 11 questions correctly. Answer by edjones(8007) (Show Source):
You can put this solution on YOUR website! t=.5 and f=.5
We could expand the binomial (t+f)^13 and get the term t^11f^2
Combination=nCr=13C11=78 coefficient of the number.
78*.5^11*.5^2
=.0095 the probability that the student answers exactly 11 questions correctly.
.
Ed
