#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

// this program assumes 10 integers in the file.

const size_t MAX_SIZE = 10;

int main() {
    int data[MAX_SIZE];
    size_t i;

    float average, standardDeviation;
    int sum = 0;
    float sum2 = 0;
    float tmp;


    // read in the 10 values
    for(i = 0; i < MAX_SIZE; i++) {
       cin >> data[i];
    }

    // sum the 10 values.
    // This could have been done in the previous loop.
    for (i = 0; i  < MAX_SIZE; i++) {
       sum += data[i];
    }

    // find the average
    average = static_cast<float>(sum) / static_cast<float>(MAX_SIZE);


    // sum the (x-avg)^2
    // this could not have been done in the previous loop.
    for( i = 0; i < MAX_SIZE; i++) {
           tmp = static_cast<float>(data[i]) - average;
           sum2 += tmp*tmp;        
    }

    standardDeviation = sqrt(sum2 / static_cast<float>(MAX_SIZE -1));

    // print the final table.
    cout << fixed << setprecision(3);

    cout << endl;
    cout << " n " << setw(10) << "x" << setw(10) << "x-avg" << setw(14) << "(x-avg)^2" << endl;
    for(i = 0; i < MAX_SIZE; i++) {
        tmp = static_cast<float>(data[i]) - average;

        cout << setw(3) << i;
        cout << setw(10) << data[i];
        cout << setw(10) << tmp; 
        cout << setw(10) << tmp*tmp;
        cout << endl;
    }


    cout << setfill('-') << setw(36) << " " << endl;

    cout << endl;
    cout << setfill (' ');

    cout << setw(13) << sum << setw(20) << sum2  << endl;

    cout << "average = " << average << endl;
    cout << "standard deviation = " << standardDeviation << endl;
    cout << endl;

    return 0;
}