Function average

average(data: readonly number[]): number
Calculates the average of all numbers in an array. Array items which aren't a valid number are ignored and do not factor into averaging.

Use minMaxAvg if you want min, max and total as well.
Parameters
- data: readonly number[]
  Data to average.
Returns number
Average of array
Example
```
import * as Numbers from 'https://unpkg.com/ixfx/dist/numbers.js';

// Average of a list
const avg = Numbers.average([1, 1.4, 0.9, 0.1]);

// Average of a variable
const data = [100,200];
Numbers.average(data);
```
See
averageWeighted To weight items based on position in array