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On a multiple choice examination with three possible answers for each of the five questions, what is the probability that a candidate would get four or more correct answers just by guessing?
  • a)
    1/243
  • b)
  • c)
    11/243
  • d)
    10/243
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
On a multiple choice examination with three possible answers for each ...
Let
X – no. of correct answers by guessing in the set of 5 multiple choice questions. 5 multiple choice questions.
Probability of success = p = 1/3
Probability of failure = q = 1 - p = 2/3
P(r) = nCprqn-r  r = 0,1,2,,....n
P (guessing more than 4 correct answers)


 
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