You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sample.rs
    path of file: ./repos/criterion.rs/src/stats/univariate
    
    the code of the file until where you have to start completion: use std::{mem, ops};

use crate::stats::float::Float;
use crate::stats::tuple::{Tuple, TupledDistribut
    
    pub fn std_dev_pct(&self) -> A {
        let _100 = A::cast(100);
        let mean = self.mean();
        let std_dev = self.std_dev(Some(mean));

        (std_dev / mean) * _100
    }