For this problem you must define a simple interface NumTrackerInterface and two implementations of the interface,

For this problem you must define a simple interface NumTrackerInterface and two implementations of the interface, Tracker1 and Tracker2. a. Define a Java interface named NumTrackerInterface.

A class that implements this interface must keep track of both the sum and the count of numbers that are submitted to it through its add method, and provide getters for the sum, the count, and the average of.....