Function inc_stats::mean

pub fn mean<I>(data: I) -> Option<f64> where
    I: Iterator<Item = f64>, 

Get the mean of a set of data

This method takes constant space and linear time.

Examples:

let nums = [2.0, 4.0];
let mean = inc_stats::mean(nums.iter().cloned()).unwrap();
assert!((3.0 - mean).abs() < 1.0e-6);