SOLUTION: A test consists of 6 multiple choice questions, each having 5 possible answers, one of which is correct. Assume that you guess the answers to all 6. Find the probability of getting
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Question 1099938: A test consists of 6 multiple choice questions, each having 5 possible answers, one of which is correct. Assume that you guess the answers to all 6. Find the probability of getting less than 2 correct.
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
The coefficients of represent the probability of
being and being on each question.
The coefficients of
==
represent the probability of all the possible different outcomes for the 6-question test:
is the probability of 6 wrong answers,
is the probability of 5 wrong answers plus one right,
is the probability of 4 wrong answers plus 2 right ones,
and so on.
So,the probability of getting less than 2 correct answers is
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