Question

Write a program that takes, as input, five numbers and outputs the mean (average) and standard deviation of the numbers. If the numbers are x₁, x₂, x₃, x₄, and x₅, then the mean is:

x = (x₁+ x₂+ x₃+ x₄+x₅)/5

and the standard deviation is:

s = √(((x₁-x)²+(x₂-x)²+(x₃-x)²+(x₄-x)²+(x₅-x)²)/5)

Your program must contain at least the following functions: a function that calculates and returns the mean and a function that calculates the standard deviation.

Format your output with setprecision(2) to ensure the proper number of decimals for testing!

Answer 1

Code:

#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
float mean(float x1,float x2,float x3,float x4,float x5)
{
   /*In this function we calculate the mean*/
   float x;
   x=(x1+x2+x3+x4+x5)/5;
   /*Here we calcuate the mean*/
   return x;
   /*here we return the mean*/
  
}
float deviation(float x1,float x2,float x3,float x4,float x5,float x)
{
   /*This function calculate the standard deviation*/
   float s;
   s=sqrt( (pow(x1-x,2)+pow(x2-x,2)+pow(x3-x,2)+pow(x4-x,2)+pow(x5-x,2))/5 );
   /*Calculating standard deviation*/
   return s;/*returning the standard deviation*/
}
int main()
{
   float x1,x2,x3,x4,x5,x,s;
   cout<<"Enter 5 numbers: "<<endl;
   cin>>x1;
   cin>>x2;
   cin>>x3;
   cin>>x4;
   cin>>x5;/*Reading 5 numbers form the user*/
   x=mean(x1,x2,x3,x4,x5);/*Here we get mean from the mean function*/
   s=deviation(x1,x2,x3,x4,x5,x);/*Here we get standard deviation from the deviation function*/
   cout<<"Mean: "<<setprecision(2)<<x<<endl;
   cout<<"Standard Deviation: "<<setprecision(2)<<s<<endl;  
   /*Here we print the result*/
}

output:

Indentation: