Mathematics, 01.11.2019 02:31 nevaehbell30

Each question on a multiple-choice exam has four choices. one of the choices is correct, worth four points. another choice is wrong but carries partial credit of one point. the other two choices are wrong and worth negative one point. if a student picks answers at random, what is the expected value of his or her score for a problem?
a 0.75
b 0.25
c 1.25
d 1.50

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