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I don't understand that this giant E does.

Is it hard?

Prove the following:

$S^{2}_x = \frac{1}{n-1}\displaystyle\sum\limits_{i=1}^n(x_i -\bar{x})^2$

edited Jun 21 '19 at 03:50 Asked Jun 18 '19 at 20:01 by Lucy