Program to Calculate Mean

Given the n-size array, find its mean.

Examples:

Input  : {1, 3, 4, 2, 6, 5, 8, 7}
Output : Mean = 4.5
Explanation: Sum of the elements is 1 + 3 + 4 + 2 + 6 + 5 + 8 + 7 = 36, Mean = 36/8 = 4.5

Input  : {4, 4, 4, 4, 4}
Output : Mean = 4

Approach:

Formula used:

Mean of an array = (sum of all elements) / (number of elements)

Follow the steps below for implementation:

• Iterate over the array and keep adding elements to a variable sum
• Divide the sum by the size of given array.

Below is the implementation of the above approach

// CPP program to find mean
#include <bits/stdc++.h>
using namespace std;

// Function for calculating mean
double findMean(int a[], int n)
{
    int sum = 0;
    for (int i = 0; i < n; i++)
        sum += a[i];

    return (double)sum / (double)n;
}

// Driver program
int main()
{
    int a[] = { 1, 3, 4, 2, 7, 5, 8, 6 };
    int n = sizeof(a) / sizeof(a[0]);
    cout << "Mean = " << findMean(a, n) << endl;
    return 0;
}

// Java program to find mean
import java.util.*;

class GFG {

    // Function for calculating mean
    public static double findMean(int a[], int n)
    {
        int sum = 0;
        for (int i = 0; i < n; i++)
            sum += a[i];

        return (double)sum / (double)n;
    }

    // Driver program
    public static void main(String args[])
    {
        int a[] = { 1, 3, 4, 2, 7, 5, 8, 6 };
        int n = a.length;
        System.out.println("Mean = " + findMean(a, n));
    }
}

# Python3 program to find mean

# Function for calculating mean


def findMean(a, n):

    sum = 0
    for i in range(0, n):
        sum += a[i]

    return float(sum / n)


# Driver program
a = [1, 3, 4, 2, 7, 5, 8, 6]
n = len(a)
print("Mean =", findMean(a, n))

// C# program to find mean
using System;

class GFG {
    // Function for
    // calculating mean
    public static double findMean(int[] a, int n)
    {
        int sum = 0;
        for (int i = 0; i < n; i++)
            sum += a[i];

        return (double)sum / (double)n;
    }

    // Driver Code
    public static void Main()
    {
        int[] a = { 1, 3, 4, 2, 7, 5, 8, 6 };
        int n = a.Length;
        Console.Write("Mean = " + findMean(a, n) + "\n");
    }
}

// JavaScript program to find mean

// Function for calculating mean
function findMean(a, n)
{
    let sum = 0
    for (var i = 0; i < n; i++)
        sum += a[i]

    return (sum / n)
}

// Driver program
let a = [1, 3, 4, 2, 7, 5, 8, 6]
let n = a.length
console.log("Mean =", findMean(a, n))

// This code is contributed by phasing17

<?php 
// PHP program to find mean 

// Function for calculating mean
function findMean(&$a, $n)
{
    $sum = 0;
    for ($i = 0; $i < $n; $i++) 
        $sum += $a[$i];
    
    return (double)$sum / 
           (double)$n;
}

// Driver Code
$a = array(1, 3, 4, 2, 
           7, 5, 8, 6);
$n = sizeof($a);
echo "Mean = " . 
      findMean($a, $n)."\n"; 
?>

Mean = 4.5

Time Complexity: O(n), Where n is the size of the given array.
Auxiliary Space: O(1), As no extra space is used.