<p>If I changed an answer on my answer sheet(to the correct answer), what is the probability that the machine will mark it wrong? The answer sheet is basically the worst paper for erasing and I couldn’t get it to be totally white.</p>
<p>I have these same questions. I marked an entire section on the wrong side and had to transfer then erase.</p>
<p>^ How would you calculate the probability o_o Well, if you think you did a good job marking it…then you probably did. The machine isn’t crude, it can tell between black and white. If you leave traces of gray, though, like you’re sketching something, it can be marked as wrong ):</p>
<p>Th CB should prbly spend a decent amount of money to get machines that are not so sensitive…although those type of things usually only happen in my school if you can still see some of original pencil marks…</p>
<p>^ Can’t you get it hand scored or something?</p>
<p>wow seems like i have a really good eraser coz i was able to erase everything completely :)</p>