The term you are looking for is "standard deviation", the measure of variance between a set of values.

To find the standard deviation

1. Find the mean.
2. For each data point, find the square of its distance to the mean.
3. Sum the values from Step 2.
4. Divide by the number of data points.
5. Take the square root.

To calculate standard deviation of an 1D array in Julia:

```julia
n=std([61, 62, 59, 60, 63, 62, 58])
```
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