double average = 0;
int sum =0;
int len =0;
for(int[] arr : scores){
for(int n : arr){
sum += n;
}
len += arr.length;
average = sum * 1.0 / len;
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東NANIAN
double average = 0;
int sum =0;
int len =0;
for(int[] arr : scores){
for(int n : arr){
sum += n;
}
len += arr.length;
}
average = sum * 1.0 / len;