imgur: the simple image sharer

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- Mar 16th 2013, 07:11 AMJoyeuxCan anyone help?
- Mar 16th 2013, 07:52 AMShakarriRe: Can anyone help?
Is your question

Show that

$\displaystyle \sigma x^2=\sum \frac{x_i^2}{N}-\sum \frac{x_i}{N}$

Becomes

$\displaystyle \sigma x^2=(\sum \frac{x_i^2}{N})-\mu x$

All sums between i=1 and N - Mar 16th 2013, 08:18 AMJoyeuxRe: Can anyone help?
Yup, any help?

- Mar 16th 2013, 09:10 AMShakarriRe: Can anyone help?
That doesn't make any sense because $\displaystyle \sum \frac{x_i}{N}$ is $\displaystyle \mu$

- Mar 16th 2013, 10:13 AMMINOANMANRe: Can anyone help?
Joyeux

There is something wrong with your formula