Based on the ratings provided, it seems that Grupa from 2019 starts off as average (between 6 and 7) and gradually improves to decent (between 7 and 8). The bingeable rating would be calculated as the average of all the episode ratings, which would be (6.8 + 6.2 + 6.2 + 5.9 + 5.7 + 5.6 + 5.7 + 5.6 + 6.2 + 7.7 + 7.7) / 11 = 6.3. So the bingeable rating is 63.
