#include <iostream>
#include <numeric>
#include <vector>

int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5};

    int sum = std::accumulate(numbers.begin(), numbers.end(), 0);

    std::cout << "Sum: " << sum << std::endl;

    return 0;
}

#include <iostream>
#include <numeric>
#include <vector>

int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5};

    double average = std::accumulate(numbers.begin(), numbers.end(), 0.0) / numbers.size();

    std::cout << "Average: " << average << std::endl;

    return 0;
}

#include <iostream>
#include <numeric>
#include <vector>
#include <cmath>

int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5};
    double mean = std::accumulate(numbers.begin(), numbers.end(), 0.0) / numbers.size();

    double variance = std::accumulate(numbers.begin(), numbers.end(), 0.0, 
        [mean](double accumulator, int val) { return accumulator + pow(val - mean, 2); }) / numbers.size();

    double standard_deviation = sqrt(variance);

    std::cout << "Standard Deviation: " << standard_deviation << std::endl;

    return 0;
}