The probability of getting 8 weekdays right in a row by random guessing is 1/7^8, or about 1 in 6 million. So my random guess is that either the number was substantially less than 8, or there was actually some extra information that you made use of somehow, or you didn't really get them right and the other people were just messing with your head. Or, of course, you're messing with ours.
It's crazy isn't it. Seriously, it was one of those moments where you think "hey how am I doing this". I really thought for a very short while I had some sort of untapped savantish ability to know the day for any date (I think there are people that can do this based on some form of learning|equation?). In actual fact I can barely remember the day it is today ...
The dates were being checked on this one kids graphing calc. He was the only person in the class, in the school I suspect, that had one.
Whilst the chance of guessing 1 in 7 eight times in a row is very small, a string of guesses that are correct in a larger population of guesses has no greater probability of being in any particular place in the string than any other. Provided that if I'd continued guessing a large number of times then I only achieved c. 14% correct then there is nothing wrong statistically with such a feat ...
Maybe I didn't guess at all. Maybe I had a psychic link with my classmates Casio ... ;0)
