SOLUTION: A quiz cosists of 20 multiple-choice questions, each with 5 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the mi
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Question 1072750: A quiz cosists of 20 multiple-choice questions, each with 5 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 60 %.
Answer by jorel1380(3719) (Show Source): You can put this solution on YOUR website!
The chance of guessing all the right answers is (1/5)^20, or 0.00000000000001048576. The chance of guessing 12 out of the 20 questions right (60%) is 20 choose 12, or 125970 x 0.00000000000001048576, or 0.0000000013208911872, which equals .00000013208911872% chance of passing. ☺☺☺☺
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