Question 637474: A test has 10 true/false questions. To pass the test, at least 7 questions have to be answered correctly. If a student guesses on each question, what is the probabilty that the student will pass the test?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A test has 10 true/false questions. To pass the test, at least 7 questions have to be answered correctly. If a student guesses on each question, what is the probabilty that the student will pass the test?
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Binomial Problem with n = 10 and P(correct) = 1/2
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P(x >= 7) = 1 - P(0<= x <=6) = 1 - binomcdf(10,0.5,6) = 0.1719
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Cheers,
Stan H.
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