#include <stdio.h>
/* Calcolo la media di 20 numeri compresi tra 2 e 10 */
int main(void) {
int a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t;
float media;
scanf("%d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d", &a
, &b
, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t);
media=(a+b+c+d+e+f+g+h+i+j+k+l+m+n+o+p+q+r+s+t)/20.0;
printf("La media è %f", media
); return 0;
}
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