SOLUTION: A quiz has 4 multiple-choice questions. Each question has 5 choices, 1 being correct and the other 4 being incorrect. Suppose you guess on all 4 questions. What is the probability

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Question 1042802: A quiz has 4 multiple-choice questions. Each question has 5 choices, 1 being correct and the other 4 being incorrect. Suppose you guess on all 4 questions. What is the probability of getting 3 questions right?
Found 2 solutions by ikleyn, MathTherapy:
Answer by ikleyn(52781)   (Show Source): You can put this solution on YOUR website!

Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!
A quiz has 4 multiple-choice questions. Each question has 5 choices, 1 being correct and the other 4 being incorrect. Suppose you guess on all 4 questions. What is the probability of getting 3 questions right?
Use the BINOMIAL PROBABILITY formula: 
Probability of getting EXACTLY 3 correct:
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