Area Under Stnd Norm Curve With Z-Score?

[Anon]

Hi. I need to find percentage distributions under a standard normal curve (aka bell-curve). All other statistics are known (standard deviation, z-score, median, total, individual scores). I need to code this in PHP (therefor I cannot look it up in a math table in a book or use various calculaters on the web to calculate this). Someone please help -- is there a script out there to do this? I'm afraid to even attempt this one =O.

Thanks in advance.

-mike

[crazney]

sure, there is an exquation for that bell curve, i cant exactly remember what it is, but work out the equation, derive it, and do your maths ;p