Logan E.

asked • 11/29/15

probability

On a college entrance exam, each question has five possible answers. If you make a random guess on the 20th question, what is the probability that you are incorrect?
I think that P(correct)=1/5 and P(incorrect)=4/5 or 80%, but am not sure if the fact that it is the 20th question makes a difference. 
Thanks

1 Expert Answer

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Joseph C. answered • 11/29/15

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Joseph, Trilingual instructor, Paso Robles, CA
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The fact that the question is number 29 is of no significance.
 
Your answers are correct.
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David W.

Ques 20 doesn't matter either.  The important concepts are the fact that you make "a random guess" and that the distractors (possible answers) are randomly placed so that the five of them have a random, uniform distribution (thus, equally likely -- we call this a "fair" question or "fair dice").
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11/29/15

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