From: Adam Prescott <mentionuse@...>
Date: 2010-09-21T21:40:25+09:00
Subject: Re: how to get Mycompute.sum().mean=2.5?

data = [1, 2, 3, 4]
sum = data.inject { |a, b| a + b } #=> 10
sum/data.size.to_f #=> 2.5