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


@nobu - yup, you are correct. The expected behaviour should be like this

```ruby
[1,2].mean #=> 1.5
```

----------------------------------------
Feature #18057: Introduce Array#mean
https://bugs.ruby-lang.org/issues/18057#change-93089

* 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.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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