A student is given a true - false exam with 10 questions. If he gets 8 or more correct answers he passes the exam. Given that he guesses at the answer to each question, what is the probability that he passes the exam ?; A student is given a true - false exam with 10 questions. If he gets 8 or more correct answers he passes the exam. Given that he guesses at the answer to each question, what is the probability that he passes the exam ?
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the prob of passing the exam is 1/20
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no. of outcomes = 20
no.of favourable outcomes = 13(8 9 10 11 12 13 14 15 16 17 18 19 20)
probability = 13/20
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