ref: b19eb5814b8568ecca87e57c7d5cd1b66df9a07d
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