Function gsl_sys::gsl_stats_long_double_wvariance_m

pub unsafe extern "C" fn gsl_stats_long_double_wvariance_m(
    w: *const u128, 
    wstride: usize, 
    data: *const u128, 
    stride: usize, 
    n: usize, 
    wmean: f64
) -> f64