Finding Mean, Median and Mode in Rust (chapter 8 exercise from rust-lang book)

main.rs

use std::collections::HashMap;

fn main() {
    let mut x: Vec<i32> = vec![6,3,2,2,5,7,9,9,8,6,4,10,11,11,11,11,12,13,14];
    println!("Inputted vector: {:?}", x);
    println!("Mean: {}", mean(&x));
    println!("Median: {}", median(&mut x));
    let y = mode(&x);
    println!("Mode: value {} occurs {} times", y.0, y.1);
}

fn mean(vec: &Vec<i32>) -> f32 {
    let len = vec.len() as f32;

    let mut sum = 0;

    for num in vec {
        sum += num;
    }
    
    sum as f32 / len
}

fn median(vec: &mut Vec<i32>) -> f32 {
    vec.sort();
    let mid = vec.len() / 2;
    
    if vec.len() % 2 == 0 {
        (vec[mid - 1] + vec[mid]) as f32/ 2.0 
    } else {
        vec[mid] as f32
    }
}

fn mode(vec: &Vec<i32>) -> (i32, i32) {
    let mut map = HashMap::new();

    for number in vec {
        let count = map.entry(number).or_insert(0);
        *count += 1;
    }

    let mut max_key: i32 = 0;
    let mut max_val: i32 = 0;

    for (k, v) in map {
       if v > max_val {
            max_val = v;
            max_key = *k;
        } 
    }

    (max_key, max_val)
}