View Compilation Error

0_0_27878109_7783.cpp: In function 'int main()':
0_0_27878109_7783.cpp:35:31: error: 'i' was not declared in this scope
     printf("%.2lf ", cou_mean[i]);
                               ^
0_0_27878109_7783.cpp:37:32: error: 'i' was not declared in this scope
     printf("%.2lf\n", cou_mean[i]);
                                ^