ref: 76c797f758b3491e00c3e9a714087452228bf78b
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