Hello everyone. im having trouble completing a question in my big java book 2nd edition by Kay Horstmann. The question is this:

Define a class Quiz that implements the Measurable interface. A quiz has a score and a letter grade (such as B+). Use the first implementation of the DataSet class to process a collection of quizzes. Display the average score and the quiz with the highest score (both letter grade and score).

I know how to implement the measurable interface but im having trouble figuring out the rest. I know this may seem like an easy question to you guys but any help is greatly appreciated. thank you,

Bradley