math variance for math> math variance {flags} 
--sample, -s: calculate sample variance (i.e. using N-1 as the denominator)| input | output | 
|---|---|
| list<number> | number | 
Get the variance of a list of numbers
> [12345] |math variance
2
Get the sample variance of a list of numbers
> [12345] |math variance-s
2.5
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