Find probability to not fail if gets sixty percent correct
Imagine that a student takes a 20-item multiple choice exam. She didn't study, so all of her answers are guesses. Each item on the exam has five possible answers. What is the probability that she would not fail, i.e. she gets at least 60% correct?
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Each item on the exam has five possible answers. What is the probability that she would not fail, i.e. she gets at least 60% correct?
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