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#include "data_stat.h"

double max(double *data, int n) {
    double result = data[0];

    for (int i = 1; i < n; i++) {
        if (data[i] > result) {
            result = data[i];
        }
    }

    return result;
}

double min(double *data, int n) {
    double result = data[0];

    for (int i = 1; i < n; i++) {
        if (data[i] < result) {
            result = data[i];
        }
    }

    return result;
}

double mean(double *data, int n) {
    double sum = 0.0;

    for (int i = 0; i < n; i++) {
        sum += data[i];
    }

    return sum / n;
}

double variance(double *data, int n) {
    double result = 0.0;
    double average = mean(data, n);

    for (int i = 0; i < n; i++) {
        double difference = data[i] - average;

        result += difference * difference;
    }

    return result / n;
}