A student is taking a multiple-choice exam in which each question has five choic

Question

A student is taking a multiple-choice exam in which each question has five choices. Assuming that she has no knowledge of the correct answers to any of the questions, she has decided on a strategy in which she will place five balls (marked A, B, C, D, and E) into a box. She randomly selects one ball for each question and replaces the ball in the box. The marking on the ball will determine her answer to the question. There are five multiple-choice questions on the exam, using the Binomial Table, determine the probability that she will get
6. five questions correct?
7. at least four questions correct?
8. no questions correct?
9. no more than two questions correct?
10. What is the expected number of questions that she will get correct?

Explanation / Answer

1. 00032 2. .00672 3. .32768 4. .94208 5. 1

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