>>361
int main(void)
{
int matrix[ROW][COL] = { {92, 80, 23, 19}, {36, 5, 62, 58},
{58, 38, 94, 76}, {25, 94, 85, 33}, {3, 81, 88, 67},};
int sum_x[ROW]={0},sum_y[COL]={0},avg_x[ROW]={0},avg_y[COL]={0};
int i,j;

for(i=0;i<ROW;i++){
for(j=0;j<COL;j++){
sum_x[i] +=matrix[i][j];}
avg_x[i]=sum_x[i]/COL;}
for(i=0;i<COL;i++){
for(j=0;j<ROW;j++){
sum_y[i]+=matrix[j][i];}
avg_y[i]=sum_y[i]/ROW;}
for(i=0;i<ROW;i++){
printf("%d行目の合計:%d　%d行目の平均:%d\n",i+1,sum_x[i],i+1,avg_x[i]);}
printf("\n");
for(i=0;i<4;i++){
printf("%d列目の合計:%d　%d列目の平均:%d\n",i+1,sum_y[i],i+1,avg_y[i]);}
return 0;
}

c言語独学4日目だがこんなもんでいいのかな？