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OpenStudy (anonymous):
A student takes a 10-question True-False quiz and randomly guesses the answer to each question. Suppose a correct answer is worth 1 point, an incorrect answer is worth -0.5 points. Find the probability that a student receives 7 or more points.
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OpenStudy (paxpolaris):
to get exactly 7 points: you need to get 8 correct and 2 wrong... 8*1 + 2(-0.5).
OpenStudy (paxpolaris):
so what the question is actually asking is : Find the probability that a student gets AT LEAST 8 correct.
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