Posted by Jen on Tuesday, July 19, 2011 at 5:31pm.
In a multiplechoice test, each question has five options. Students will get 5 points for each correct answer; lose 2 point 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

Math  Kallie, Tuesday, July 19, 2011 at 9:19pm
I would say that it is to her disadvantage because if you guess an answer and get it wrong then you lose 2 points but if you don't put anything then you don't gain any points or lose any points. There is a chance she would most likely get it wrong if she guessed, So i would have to say not guessing is the better way to go if you arent going to lose any points for putting no answer.
This was a really confusing question so im not sure that my answer is correct but i tried answering it as best as i could... sorry :(

Math  Kallie, Tuesday, July 19, 2011 at 9:43pm
But actually now that i think of it, i think im right because she has a 75% chance its wrong. And she would lose 2 points.
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