Question: 2.7 For a multiple-choice test item with four response options, the probability of obtaining the correct answer by simply guessing is 0.25. If a student

2.7 For a multiple-choice test item with four response options, the probability of obtaining the correct answer by simply guessing is 0.25. If a student simply guessed on all 20 items in a multiple-choice test:

a. What is the probability that the student would obtain the correct answers to 15 of the 20 items?

b. What is the expected number of items the student would answer correctly?

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