Whats the formula for standard and average deviation?

Question

i need the mathematical formula, and steps on how to find it on a calculator. plzz help i need this for today.

10 points for the best who explains thank!

Answer 1

Depends on your calculator.  Look for a function labelled "SD" or "∑x" or "σx".

Definitions of each below.

You should have studied.

Answer 2

what type of calculator do you use (please specify)

Answer 3

you must go thruogh the  documentation of your calculator

in that step by step  the expalnation is there

coming to the  formula you find in any  stats  book for mean and standard deviation or take he help of google.

most of the stats material and concepts  to the highest level are available on line for  free

The Standard Deviation Formula

http://www.mathmotivation.com/symbolic/s...

so explore  it is real fun. enjoy and devour it