Program To Get Quiz Scores

So for this project I'm going to take in some quiz scores, then eventually get the total number, the range, the mean, and others... Here's the instructions for the two methods I need to create but am completely stuck on:

2. public boolean inputData(Scanner in)
2.1.takes in a Scanner object passed in from main()
2.2. asks the user for a number in the range of 0 through 100.
2.3.It must read a number into an integer variable unless a non-number value is entered, in which case the method will return false. You may use try/catch or an if statement for this.
2.4.If the datum/score seems acceptable, the addGrade method must be called.
2.5.If addGrade returns false, then inputData should throw an IllegalArgumentException or return false
Otherwise, inputData should return true. See section 11.4 for exceptions.

3. public boolean addGrade
3.1.takes in an integer grade. If grade is not in the range of 0 through 100 the method should return false.
Otherwise, it should appropriately change the values of numberOfQuizzes, highValue, lowValue,
3.2.totalQuizScore , sumOfSquares (used in variance calculation), and add one to the count of the proper variable for A's, B's, C's, D's or F's. The method should then call calculate and return true

Now I have done very little with booleans in class at all, so this is all very confusing for me. I've tried to do a lot of research on my own and so far I came up with the following for the two methods above:

public boolean inputData()
{
int score = 0;
System.out.println("Please enter values, Q to quit:");
Scanner in = new Scanner(System.in);
while (in.hasNextInt())

[Code] ....

Honestly I'm not really sure what I'm doing wrong at all, and I have done a lot of research but can't really find anything too similar to what the instructions want so I'm not sure what's right/wrong.