True or false multiple question paper, deduction of marks if incorrect answer. is it best to answer all true?

I'm taking a 100 question multiple choice question paper on Tuesday, but I don't know the subject very well. It's true or false question with 1 mark for a correct answer and minus half a mark for a false one. Would I be able to achieve statistically an OK mark grade if I just put true for all the answers? Or would it be wiser to answer only the questions I know the answer to?True or false multiple question paper, deduction of marks if incorrect answer. is it best to answer all true?
Answer them all with your best guess. If you haven't a clue, go ahead and answer true.





You can expect about half of the answers to be true and about half to be false. So if you answer all of them true, you can expect to get a full point for half of them, and a negative half point for the other half, averaging out to about a quarter point per question.





If you answer all 100 questions this way, you can expect to score 25 points -- probably not ';statistically an OK mark grade.';





What you want to do is:


(1) Answer all the questions you know. You'll expect to earn near 100% for these questions.





(2) If you aren't certain, but have a feeling one way or the other, follow your gut. You won't expect to earn full marks for these, but probably something better than 25%.





(3) If you really have no idea, go ahead and answer all true or however you like. You'll only expect to earn a quarter point for these, but it's better than nothing.True or false multiple question paper, deduction of marks if incorrect answer. is it best to answer all true?
u should mark it all true. because.....





let x be the questions whose answers are true


let y be the questions whose answers are false





your mark is calculated by





(1x - 0.5y) / 100 if u mark it all true because u get one mark for each correct answer and minus half a mark for an incorrect one





if u only mark the ones u know, u'd get one mark minused anyways so your mark woud be





(1x - 1y) / 100 and i would rather get 0.5 minused for one wrong answer than one full mark for an unanswered one





but u never did explain what happens if u dont answer at all so i dont know what ur talking about please add more info