Make TV show's Ratings a sum of the episodes

Tv shows unlikd movies should have somewhat a different rating system. Imo a tv series rating should come from the sum of the episodes rating and not have a rating as a whole show even tho some tv shows are better as a whole and do not rely in individual episodes. But still imo a tv series rating should be a sum of the episodes rating. Hope you like it or make an even better rating system because sometimes it is biased.