Question

Write a program, using C#, that will find the mean and standard deviation of a number of data points. The ONE PROGRAM should allow the user to enter data manually OR via a text file.

Answer 1

using System;

namespace Mean_Standard_Deviation
{
   class MainClass
   {
       public static void Main (string[] args)
       {
           //declare number of data points
           int n;
           //declare sum, mean,standard deviation
           double sum=0.0,mean,standardDeviation,total=0.0;
           //Input data points
           Console.WriteLine("Enter number of data points");
           n=Convert.ToInt32(Console.ReadLine());
           //declare array of data points
           double[] points=new double[n];
           //Input the data points
           Console.WriteLine("Enter points");
           for(int i=0;i<n;++i)
           points[i]=Convert.ToDouble(Console.ReadLine());
           //calulate sum
           for(int i=0;i<n;++i)
           sum+=points[i];
           //calculate mean
           mean=sum/n;
           //calculate standard deviation
           for(int i=0;i<n;++i)
           total+=(points[i]-mean)*(points[i]-mean);
           standardDeviation=Math.Sqrt((total/n));
           Console.WriteLine ("Mean = {0}",mean);
           Console.WriteLine ("Standard Deviation = {0}",standardDeviation);
       }
   }
}

Output