Mean of an Array

Last Updated : 18 Mar, 2025

Given an array arr[]. The task is to find the mean(floor value) of the array.

Examples:

Input: arr[] = [1, 3, 4, 2, 6, 5, 8, 7]
Output: 4
Explanation: Sum of the elements is 1 + 3 + 4 + 2 + 6 + 5 + 8 + 7 = 36, Mean = 36/8 = 4

Input: arr[] = [4, 4, 4, 4, 4]
Output: 4
Explanation: Sum of the elements is 4 + 4 + 4 + 4 + 4 = 20, Mean = 20/5 = 4

Writing Your Own Method

To find the Mean, simply find the sum of all the numbers present in the array. Then, simply divide the resulting sum by the size of the array

C++

#include <bits/stdc++.h> using namespace std;  int findMean(vector<int>& arr) {   	int n = arr.size();     int sum = 0;     for (int i = 0; i < n; i++)         sum += arr[i];      return sum / n; }  int main() {     vector<int> arr = { 1, 3, 4, 2, 7, 5, 8, 6 };   	 cout<<findMean(arr) << endl;     return 0; }

#include <stdio.h>  int findMean(int arr[], int n) {     int sum = 0;     for (int i = 0; i < n; i++)         sum += arr[i];      return sum / n; }  int main() {     int arr[] = { 1, 3, 4, 2, 7, 5, 8, 6 };     int n = sizeof(arr) / sizeof(arr[0]);     printf("%d\n", findMean(arr, n));     return 0; }

Java

import java.util.Arrays;  class GfG {    	static int findMean(int[] arr) {         int sum = 0;         for (int num : arr)             sum += num;          return sum / arr.length;     }      public static void main(String[] args) {         int[] arr = { 1, 3, 4, 2, 7, 5, 8, 6 };         System.out.println(findMean(arr));     } }

Python

def findMean(arr):     return sum(arr) // len(arr)  if __name__ == "__main__":   arr = [1, 3, 4, 2, 7, 5, 8, 6]   print(findMean(arr))

using System;  class GfG {     static int FindMean(int[] arr) {         int sum = 0;         foreach (int num in arr)             sum += num;          return sum / arr.Length;     }      static void Main() {         int[] arr = { 1, 3, 4, 2, 7, 5, 8, 6 };         Console.WriteLine(FindMean(arr));     } }

JavaScript

function findMean(arr) {     let sum = 0;     for (let num of arr)         sum += num;      return Math.floor(sum / arr.length); }  // Driver Code const arr = [1, 3, 4, 2, 7, 5, 8, 6]; console.log(findMean(arr));

Output

Time Complexity: O(n)
Auxiliary Space: O(1)

Using Library Methods

C++

#include <bits/stdc++.h> using namespace std;  int findMean(vector<int>& arr) {     return accumulate(arr.begin(), arr.end(), 0) / arr.size(); }  int main() {     vector<int> arr = { 1, 3, 4, 2, 7, 5, 8, 6 };     cout << findMean(arr) << endl;     return 0; }

Java

import java.util.Arrays; import java.util.OptionalDouble;  public class Main {     public static double findMean(int[] arr) {                  // Use stream to calculate mean         OptionalDouble sum = Arrays.stream(arr).average();                  // Return mean or 0 if array is empty         return sum.isPresent() ? sum.getAsDouble() : 0.0;      }      public static void main(String[] args) {         int[] arr = {1, 3, 4, 2, 7, 5, 8, 6};         System.out.println(findMean(arr)); // Print mean     } }

Python

def find_mean(arr):     return sum(arr) // len(arr)  if __name__ == '__main__':     arr = [1, 3, 4, 2, 7, 5, 8, 6]     print(find_mean(arr))

using System; using System.Linq;  public class MainClass {     public static double FindMean(int[] arr) {                  // Use LINQ to calculate mean         double mean = arr.Length > 0 ? arr.Average() : 0.0;                  // Return mean or 0 if array is empty         return mean;     }      public static void Main(string[] args) {         int[] arr = {1, 3, 4, 2, 7, 5, 8, 6};         Console.WriteLine(FindMean(arr)); // Print mean     } }

JavaScript

function findMean(arr) {     return arr.reduce((a, b) => a + b, 0) / arr.length; }  const arr = [1, 3, 4, 2, 7, 5, 8, 6]; console.log(findMean(arr));

Output

When to use and avoid array

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Mean of an Array

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