No offense, but I think a basic lesson in debugging is applicable here:

• Is $sum actually 0 when you start (we're pretty sure that my $sum; would set it to 0, but I never trust that kind of thing.)

• Have you printed the values out as you go? For each loop iteration, printing out the value of all variables involved would prove to be useful.

• Is the algorithm correct? You're recalculating the $std value everytime through the loop. I suck at math, but is this correct? Using the code you have there, I get the exact same result.

I'll give you a hint: You're dividing by $avg, but I don't see it being set anywhere. Do you?

--Chris

e-mail jcwren

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