For picking the answer for a multiple-choice question, we usually will delete th
ID: 3249764 • Letter: F
Question
For picking the answer for a multiple-choice question, we usually will delete the choices that( we are sure) are not the correct answer. For the remaining ones (we have no idea which is correct one), we pick randomly. Now suppose for a multiple-choice question in the Final exam( with 5-choices), there is a 50% probability that you can delete 4 wrong choices; and 20% probability that you can delete 3 wrong choices, and 30% probability that you can delete nothing. find the probability that you can get the correct answer for such a multiple choice question.
Explanation / Answer
Probability that you can get the correct answer for such a multiple choice question = 0.5x1 + 0.2x(1/2) + 0.3x(1/5)
= 0.66
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