# Calculate Standard Deviation

## Clip, 3

```
.sk
```

`.s`

is the standard deviation, `k`

parses the input in the form `{1,2,3}`

.

## Mathematica, ~~24~~ 22 bytes

Nice, Mathematica has a built-in `StandardDevi...`

oh... that computes the sample standard deviation, not the population standard deviation.

But what if we use `Variance`

... oh... same deal.

But there is yet another related built-in:

```
CentralMoment[#,2]^.5&
```

Yay. :)

This also works for 22 bytes:

```
Mean[(#-Mean@#)^2]^.5&
```

And this for 27:

```
N@RootMeanSquare[#-Mean@#]&
```

## Octave, 14 bytes

```
g=@(a)std(a,1)
```

Try it on ideone.