Function rgsl::statistics::wmean

pub fn wmean(w: &[f64], wstride: usize, data: &[f64], stride: usize, n: usize) -> f64

This function returns the weighted mean of the dataset data with stride stride and length n, using the set of weights w with stride wstride and length n. The weighted mean is defined as,

\Hat\mu = (\sum w_i x_i) / (\sum w_i)