include "stdio.h"main(){ float student[20],ave,sum=0,max=0,min=100;int i;for(i=0;i<20;i++){ printf("input %dth score:",i+1);scanf("%f",&student[i]);if(student[i]>max)max=student[i];if(student[i]<min)min=student[i];sum+=student[i];} ave=sum/20;printf...