C# Program to Find Mean, Standard Deviation and Variance

C# Program to Calculate Mean, Standard Deviation and Variance

This C# program is used to find the mean, variance and standard deviation for floating number using for loops and Math.Sqrt method.

Number of floating elements is also the user input and need to provide list of floating array elements.

Reads n array floating elements and finds the mean, standard deviation and variance values and displaying it.

/*
 This C# program to display Mean, Variance and Standard Deviation.
 Also added single and multiline comments.
 */
using System; // System is a namespace

public class StandardDeviation
{
    // Main method which starts the program execution.
    public static void Main()
    {
        int n;

        float deviation, sum, sumsqr, mean, variance, stddev;
        
        Console.Write("Enter number of elements:");
        n = int.Parse(Console.ReadLine());
        float[] num = new float[n];
        sum = 0;
        sumsqr = 0;
        /* Reading array elements */
        Console.WriteLine("Input " + n + " values");
        for (int i = 0; i < n; i++)
        {
            num[i] = float.Parse(Console.ReadLine());
            sum += num[i];

        }

        mean = sum / (float)n;
        Console.WriteLine("Mean is "+ mean);
        for (int i = 0; i < n; i++)
        {
            deviation = num[i] - mean;
            sumsqr += deviation * deviation;
        }
        /* variance */
        variance = sumsqr / (float)n;
        stddev = (float)Math.Sqrt(variance);
        Console.WriteLine("Standard Deviation is " + stddev);
        Console.WriteLine("Variance is " + variance);
        Console.ReadKey();
    }
}

C:> csc StandardDeviation.cs
C:> StandardDeviation
Enter number of elements:5
Input 5 values
32
42
76
21
14
Mean is 37
Standard Deviation is 21.70714
Variance is 471.2