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July 23, 2014

July 23, 2014

Posted by **darius** on Tuesday, August 28, 2007 at 10:15pm.

- statistics -
**MathGuru**, Tuesday, August 28, 2007 at 11:41pmYour data:

X P(X)

0 0.50

1 0.41

2 0.05

3 0.04

Here's a formula for the mean:

SUM[X * P(X)]

(Take each X times its respective P(X), then sum for a total. This will be your mean.)

Here's a formula for the standard deviation:

SQRT of {SUM[X^2 * P(X)] - mean^2}

(Square each X. Take each X^2 times its respective P(X), then sum for a total. Subtract mean^2 from this value. Then take the square root of that result. This will be your standard deviation.)

I hope this will help get you started.

- statistics -
**steve**, Monday, August 12, 2013 at 1:14pm0.57

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