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

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12-10-2017
Mathematics

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

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altavistard altavistard · Answer 1 · 2017-10-12T03:48:37+02:00

altavistard altavistard

12-10-2017

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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