PROBABILITY BY BINOMIAL DISTRIBUTION - a 10 correct There are 20 questions with 4 options each Probability of guessing a right answer each time is =

PROBABILITY BY BINOMIAL DISTRIBUTION - a 10 correct There...

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a) 10 correct There are 20 questions with 4 options each. Probability of guessing a right answer each time is ¼ = 0.25 So, probability of guessing 10 correct answers is P(X=10) ( 20 10 ) ( 0.25 ) 10 ( 0.75 ) 10 = 0.0099 b) Probability of guessing at least 5 correct is P(X 5 ¿ k = 5 20
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