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There are 3 multiple choice questions. each questions has 4 choices but only one is correct. what is the probability of getting exactly 2 correct? What is the probability of getting at least one correct?
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There are 3 multiple choice questions. each questions has 4 choices but only one is correct. what is the probability of getting exactly 2 correct? What is the probability of getting at least one correct?

User Anthony Calandra
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1 Answer

5 votes

Answer:

P(exactly 2 correct) = 3(1/4)(3/4)² = 27/64

P(at least 1 correct) = 1 - (3/4)³ = 37/64

User GreyRoofPigeon
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