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3. A multiple choice test contains 15 questions. Each question has four options, only one of which is correct. What is the probability of guessing exactly 9 questions correctly?
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4 votes
3. A multiple choice test contains 15 questions. Each question has four options, only one of

which is correct. What is the probability of guessing exactly 9 questions correctly?

User Sylvie
by
8.0k points

1 Answer

3 votes

Answer:


(5005* 3^6)/(4^(15))

Explanation:

by using binomial property, we get the probability


P=C^(15)_(9)* (1)/(4^9)* (3^6)/(4^6)

User Farid Chowdhury
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