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A student correctly answers 15 of the first 20 questions on an examination.

A student correctly answers 15 of the first 20 questions on an examination.
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A student correctly answers 15 of the first 20 questions on an examination.

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User John Zeringue
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I imagine you're being asked to predict the success rate in answering questions AFTER the 20th has been answered.  15/20 represents a success rate of 0.75.  It's reasonable to use 0.75 as the probability of success on the 21st question and beyond.
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User Halil Ozel
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