[ruby-core:104751] [Ruby master Feature#18057] Introduce Array#mean

Issue #18057 has been updated by bkuhlmann (Brooke Kuhlmann).


 You can also use the [Refinements](https://www.alchemists.io/projects/refinements/#_mean) gem which also provides `#mean` support.

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Feature #18057: Introduce Array#mean
https://bugs.ruby-lang.org/issues/18057#change-93087

* Author: ggmichaelgo (Michael Go)
* Status: Open
* Priority: Normal
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Introduce Array#average to calculate the average value of an array.

```ruby
array = [1, 2, 3]
array.mean # 2

array = [1.5, 2.2, 3.1]
array.mean(&:round) # 2.3333333333333335

array = [-3, -2, -1]
array.mean { |e| e.abs } # 2
```



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