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

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

* 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.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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