Question

4. Write a C++ program Write a program that takes as input five numbers and outputs the mean (average) and standard deviation of the numbers. If the numbers are xi, Xa, x3, Xa, and xs, then the mean is x = (Xi + X2 + X3+ X4 + Xs)/5 and the standard deviation is: 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. 30 pts

Answer 1

#include <iostream>

#include <cmath>
using namespace std;
int main() {

    int array[5];

     for(int i = 0; i < 5 ; i++) {
          cin >> array[i];
     } 

   cout<<"Mean value is "<<getMean(array);
 
   cout<<"The standard deviation is "<<getStandardDeviation(array);    
}

float getMean(int array[ ]){

 float sum = 0.0, mean;

 for(i = 0; i < 5; ++i){
      sum += array[i];
 }
      mean = sum/5;

return mean;

}

float getStandardDeviation(int array[ ]){

float variance = 0.0, stdDeviation;

     for(i = 0; i < 5; ++i){
      variance += pow(array[i] - mean, 2);
      }
      variance=variance/5;
      stdDeviation = sqrt(variance);

return stdDeviation;

}