⍝ Arithmetic mean:

    mean 1 2 3 4
2.5

    square←*∘2
    sqrt←*∘0.5
    stdev←{sqrt(mean square ⍵)-square mean ⍵}   ⍝ standard deviation.

    ⎕pp←5

    stdev 2 2 2
0
    stdev 1 2 3
0.8165

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