#include <stdio.h>
 
// 再帰関数
// □引数
//  org_count ... 入力全体の個数。平均計算に使用。不変
//  count ... 残りの入力数。呼び出し毎に１減らすことで再帰処理を制御する
//  total ... 入力された値の合計。平均計算に使用。呼び出し毎に加算する。
//  average ... 平均値の取り出し用
//  disp_total ... 偏差の集計用。tempo変数と同じ役割。
void calc(const int org_count, int count, double total, double *average, double *disp_total)
{
    double value;
 
    if (count == 0) {
        *average = total / (double)org_count;
        return;
    }
 
    scanf("%lf", &value);
    calc(org_count, count-1, total + value, average, disp_total);
 
    *disp_total += (value - *average)*(value - *average);
}
 
// 
// □引数
//  count ... 入力したい数。
//  average ... 平均値を取り出す。
//  dispersion ... 分散を取り出す。
//
// □備考
//  呼び出しやすいように整形した関数のエントリポイントです
//  初期化処理や必要な変数を確保しています
void CalculateAverageAndDispersion(int count, double *average, double *dispersion)
{
    double t = 0.0;
    double a = 0.0;
 
    if (count > 0) calc(count, count, 0.0, &a, &t);
 
    if (average) *average = a;
    if (dispersion) *dispersion = t / (double)count;
}
 
 
int main(void) {
    int count;
    double average, dispersion;
 
    printf("input number of data:");
    scanf("%d", &count);
 
    printf("\n");
 
    CalculateAverageAndDispersion(count, &average, &dispersion);
 
    printf("ave : %lf\n", average);
    printf("dis : %5.3lf", dispersion);
 
    return 0;
}

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10
3.9
10.4
9.5
7.5
2.8
4.8
2.9
8.1
3.2
9.9