SOLUTION: In a multiple-choice test, each question has five options. Students will get 4 points for each correct answer; lose 2 points for each incorrect answer; and receive no points for un
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Question 477561: In a multiple-choice test, each question has five options. Students will get 4 points for each correct answer; lose 2 points for each incorrect answer; and receive no points for unanswered questions. A student does not know the correct answer for one question. Is it to her advantage or disadvantage to guess an answer? Show your calculations for expected value. Show your work for full credit.
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
The expected value is  - 2(\frac{1}{5})- 2(\frac{1}{5})- 2(\frac{1}{5})- 2(\frac{1}{5}))
, which is negative. Hence, in the long run, it is a disadvantage to guess.
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