[ruby-core:104741] [Ruby master Feature#18057] Introduce Array#average

Issue #18057 has been updated by ggmichaelgo (Michael Go).


Introduce Array#average to calculate the average value of an array.

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

array = [1.5, 2.2, 3.1]
array.average(&:round) # 3.5

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

Related PR:
https://github.com/ruby/ruby/pull/4699

----------------------------------------
Feature #18057: Introduce Array#average
https://bugs.ruby-lang.org/issues/18057#change-93076

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

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

array = [1.5, 2.2, 3.1]
array.average(&:round) # 3.5

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



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