In your Fill_Array function, you don't set the number_used variable to the number of items found.
In your print_array function:
void Print_Array(int Size[], int count)
{
int number_used = 0;
for(int index = 0; index < number_used; index++)
cout << Size[index] << " ";
} You should use the
count that is passed in, rather than the number_used variable that is set to 0
The Calc_Average and Calc_Median functions need to be passed the number of items in the array, rather than using MAX_SIZE
Also, your array is of type int, and the input has floating point numbers, you should look into using type double.