Q. 115.0( 1 Vote )

On a multiple cho

Answer :

This question is based on Bernoulli’s distribution.


Here the experiment is to get 4 or more correct answers by guessing n=5 questions.


There are three possible answers, P(getting correct answer)



And P(getting wrong answer)



Let X be the number of correct answers, then


where x=0,1,….,n. and p+q=1


Now we have to calculate


P(getting 4 or more correct answers)=P(4)+P(5)





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