Mathematics, 30.04.2021 19:00 jetblackcap

In a multiple-choice test each question has five possible answers. Two points are given for each correct answer but
one point is deducted for each incorrect answer. What is the
expected value for a question that is answered by randomly
guessing the answer?
A O
B 0.2
C -0.4
D 0.4

Answers: 3

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In a multiple-choice test each question has five possible answers. Two points are given for each c...