I think that he's assuming that each question has 5 answers to choose from (standard in North America). So that would be a 20% chance of getting the question correct.I still can't quite fathom that for the most important, life-forming test ever you can guess an answer you're not sure about and have a 20% of getting it right. That doesn't show ability, it just shows you can get lucky[/b].Applying some basic logic and maths, you're a bit off.

For ONE question, you have a 1 in 4 / .25 chance of getting that question correct. So, for 20 questions, as you have a 1/4 chance per question, you'll most likely get a score of 5/20.

However, the chances of getting a perfect score would be (1/4 X 1/4..... X 1/4 20 times) which is 0.000000000001= F all chance in anyone's language.

For the record, I'm not a fan of multiple choice, especially for subjects like history and languages.

If you did this for every question, it would average out to a 20% score (given a large enough sample size).

So if you know only 70 answers out of a hundred, you can still expect to get a 76%. Not a great system, if you ask me.

I remember in university, they dealt with this problem by making incorrect multi-choice answers worth

*-1*points (while leaving the answer blank would just give you a zero). It discouraged guessing, and made it much easier for professors to immediately see which questions students were uncertain about.

Would suck to get you test back and see that you got a -80%, though,