Question

There are 50 questions in of an exam. A student's probability of getting an answer correct is 45 . Then the probability that he is unable to correctly answer less than 2 questions

Answer 1

Step-by-step explanation:

There are 50 questions in an exam

Probability of each question to be correct =p=54

Probability of each question is incorrect =q=51

Let X= number of correct question in 50 questions

Hence required probability =p(X=0)+p(X=1)==p(X=0)+p(X=1)=(51)50+50C1(54)1(51)49=(51)50(1+200)=201(51)50

Answer 2

Answer:

There are 50 questions in of an exam. A student's probability of getting an answer correct is 45 . Then the probability that he is unable to correctly answer less than 2 questions

Step-by-step explanation:

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nan

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