Ask Me Help Desk - How do you figure the sum of squared deviation and variance

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How do you figure the sum of squared deviation and variance

I would like to know how to get the sum of squared deivation, variance and standard deviation for the following numbers:

1,112; 1,245; 1,361; 1,372; 1,472

The sum square, $\Sigma x^2$ , is obtained when you square each term, and add them up.

Variance can be obtained using this equation:

$\sigma ^2 = \frac{\Sigma x^2}{n} - $\frac{\Sigma x}{n} $^2$

Standard deviation can be obtained from this:

$\sigma = \sqrt{\frac{\Sigma x^2}{n} - $\frac{\Sigma x}{n} $^2}$

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