Shahid0072 said:
is it true that einstein made the puzzle
Extremely doubtful. The earliest sources of the puzzle are from Life International magazine in the 1960's, where no attribution was given Einstein. The problem likely originated there, or from a few people passing it around, and was attributed to Einstein incorrectly later on.
Shahid0072 said:
and only 2% can solve it?
No. There is no data to support this claim that I'm aware of, it's most likely completely fictitious. Any study done to support this claim would likely be documented, but it seems no documents on the subject have surfaced.
The problem isn't actually very DIFFICULT, it's just involved. Most "regular" people will be bored and give up. The logical connections necessary in the problem isn't all that involved-- try "the hardest logic problem in the world" for a more difficult one (the one with the liar/truth-telling gods whose language you don't know).
Shahid0072 said:
IQ will give you a general idea of intelligence, but take it with a grain of salt. IQ tests decades ago were arranged so that Americans would score more highly on them, possibly due to cultural references (I don't know the specifics). The idea of IQ tests is really to classify people for education purposes, not for intellect. Hence, you can determine whether or not a student falls "below normal" or "above normal" in order to place them in a more appropriate learning environment.
As such, IQ tests are effectively forever out of date. The intent is that your "average" person will score 100-- but because people as a society are slowly becoming more intelligent (by IQ test standards), IQ tests need to be re-calibrated for placement purposes.
IQ test scores are also misleading. There are various aspects to intelligence, so it doesn't boil down to a single number. Further, the cultural context of the subject and the version of the test can affect the score you get. It can give you a rough idea of your intelligence level, but don't expect that one number to be exact or mean very much.
DaveE