Don't expect anyone to do your homework for you...  but here's a couple of pointers.

First off you need to understand what an array is (have you looked in the Reference?).  Basically it's a 'container' that can store multiple variables of the same type, and the type of variable can be pretty much anything (i.e. ints, floats, strings, objects etc.).  I'm afraid the code you've posted doesn't include an array, so I doubt it properly answers the question you've been set.

Still arrays aren't all that difficult to work with; you just need to understand how to create them and how to extract values from them.  You can find examples in the Reference and the Learning section, but just in case here's another:

1. // declare and populate an int array
2. // start with the type of array (in this case int) and then add the braces to indicate an array then the array name
3. // curly braces are a shortcut to populating an array
   
4. int [] intArray = {1,2,3,4,5};
5. 
   
6. void setup() {
7.   calcAverage(intArray);
8. }
9. 
   
10. // function that takes an array as a parameter
    
11. int calcAverage(int[] inputArray) {
12.  
13.   // iterate over the contents of the array:
14.   // note how you can get the number of objects in an array with its 'length' property
15.   for(int i=0; i< intArray.length; i++) {
16.     // access the stored value by referencing the index of the array
17.     // note that array indices start at zero
18.     int currentValue = intArray[i];
19.     println(currentValue);
20.   }
21.  
22.   // return the average...
23. }

This isn't the final answer to either of your questions, but should provide the basic framework to easily deal with 'question one' which you thought you had solved... and assuming you've understood how it works it shouldn't take too much trouble to extend it to work with two arrays...

Good luck; though next time I'd suggest you organise yourself a little better and give yourself plenty of time to figure things out properly for yourself...