# Variance and Standard Deviation - Standard Deviation of a Discrete Frequency Distribution

#### notes

The given discrete frequency distribution be
x : x_1,   x_2,     x_3 ,. . . , x_n
f : f_1,    f_2,     f_3 ,. . . ,  f_n
In this case standard deviation

(σ) = $\sqrt{{\frac{1}{N}}\displaystyle\sum_{i=1}^{n} f_i (x_i - \bar{x} )^2}$

where N = $\displaystyle\sum_{i=1}^{n} f_i$.

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Standard Deviation Discrete series [00:08:55]
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