### standard-deviation

#### standard-deviation list

Reports the sample standard deviation of a list of numbers. Ignores other types of items.

(Note that this estimates the standard deviation for a sample, rather than for a whole population, using Bessel's correction.)

    show standard-deviation [1 2 3 4 5 6]
    => 1.8708286933869707
    show standard-deviation [energy] of turtles
    ;; prints the standard deviation of the variable "energy"
    ;; from all the turtles

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