ref: 64a7dd4b6d12588c5f9dbdd858693abcb9f63966
dir: /stt/stddeviation.t/
The standard deviation of a variable X is computed as...
.Bp
The standard deviation of a variable X is computed as:
.EQ
s = sqrt {{sum from 0 to N ({X sub i} - {X highbar}) sup 2} over {N - 1}}
.EN