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)