hours of internet use

void setup(){
 int [][]hours_in={{1,2,5,3,4,2,5},
                            {2,3,4,5,1,2,5},
                            {1,5,3,2,4,5,4},
                            {3,2,1,3,5,4,5},
                            {5,1,2,4,6,4,5}};
  for(int i=0;i<hours_in.length;i++){
   println("People " +(i+1)+ " use the internet "+sum_hrs(hours_in[i])+" hours per week");
   println("  approximately average = "+round(avg_hrs_approximately(hours_in[i]))+" hours per day");
   }
}
int sum_hrs(int []a){
  int sum=0;
  for(int i = 0; i < a.length; i++){
    sum=sum+a[i];
  }
  return sum;
}
float avg_hrs_approximately(int []b){
  float average=0;
  for(int j = 0; j < b.length; j++){
    average=average+b[j];
  }
    average=average/b.length;
    return average;
}