Negative Marking

I am probably one of those who are still frequently blogging, while the rest are busy studying. Why? Because I'm getting sick and tired of studying. I literally get headaches when I read my e-commerce text book now, so I'm putting it aside till I feel better. Not that time is on my side though.

Exam stress is on everyone. Last night while walking back from cheers, I could actually hear someone crying from one of the old KR blocks. Mind you it was not weeping, it was loud wailing, and I am assuming its because of exam stress. As for me, somehow or rather, I am hoping my papers come as soon as possible.

Now I am not an economist, nor am I good at math and figures. But can someone figure this out. My paper has mcq questions tomorrow, 1 point for a correct one, 0 point for a blank answer. But here is the catch, -0.2 marks for a wrong answer. So looking at the figures, and factoring in probability, shouldn't I just disregard the negative marking thing, and just try my luck for all the questions?

Lets take 5 questions into perspective. If I get all 5 correct, I get 5 marks. I get all 5 wrong, I lose 1 mark in all. If I leave all 5 blank, I lose 0 marks. But then if I try my luck and attempt all, and lets say even if I get just 1 question correct, I actually lose only 0.8 marks, but gain back 1 mark, so thats gaining 0.2 marks. So comparing gaining 0.2 marks, to losing 0 marks, with a low probability of only 1/5, shouldn't I just try all questions, and not be worried about negative marking. Or did I get my calculations wrong there? Hmm ...