/*
 *  Find the mean and standard deviation of numbers kept in an array (MeanStdArray.cpp).
 */
#include <iostream>
#include <iomanip>
#include <cmath>
#define SIZE 7
using namespace std;

int main() {
   int marks[] = {74, 43, 58, 60, 90, 64, 70};
   int sum = 0;
   int sumSq = 0;
   double mean, stdDev;
   for (int i = 0; i < SIZE; ++i) {
      sum += marks[i];
      sumSq += marks[i]*marks[i];
   }
   mean = (double)sum/SIZE;
   cout << fixed << "Mean is " << setprecision(2) << mean << endl;

   stdDev = sqrt((double)sumSq/SIZE - mean*mean);
   cout << fixed << "Std dev is " << setprecision(2) << stdDev << endl;

   return 0;
}