Qualification > Math

Maths help paper 1 & 6 :D normal distribution :D :D :D

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superduper2009:
one more quick question :P
cie october november 2008 paper 6..... question 1
I get the mean...but i get the standard deviation wrong...
can you please explain how to calculate the standard deviation

EDIT
STOP STOP... I GOT IT I WASN'T SQUARING THE MEAN SORRY SORRY  :D

astarmathsandphysics:
Use
where

superduper2009:
thank you sooooooooooooooooooooo much :D :D :D :D :D :D i really really appreciate it

astarmathsandphysics:
Done now. Every time I try something new with the version of latex on the forum I have to do some pfaffing around

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