Function mean 

pub fn mean<T: Real>(xs: &[T]) -> Option<T>

Mean (average) of a slice. Returns None for an empty slice.

Examples

use mathverse_core::ops::mean;

assert_eq!(mean(&[1.0, 2.0, 3.0, 4.0]), Some(2.5));
assert_eq!(mean::<f64>(&[]), None);