Question

Erin is taking a multiple choice test with 4 answer choices where she earns 5 points for every correct answer, loses 2 points for every incorrect answer and 0 points for leaving a question blank. If she doesn't know the answer to a question, what should she do? Justify your answer.

Answer 1

sounds like an application of expected value

Answer 2

5(1/4) - 2(3/4) = -1/4; i would say that since the expected value of guessing is negative, that she should skip the questions.

Answer 3

thanks @amistre64