When studying with Pocket Prep, you will see a Community Average in two different places: your Stats and your Quiz Results.
In your Stats, the Community Average reflects the percent of your correct answers relative to all questions answered correctly by all other users studying the same exam.
In your Quiz Results, the Community Average reflects the average of the community scores for all of the questions in that quiz, according to how many total (correct and incorrect) answers all of the questions in the quiz have received.