system
Given the following post, respond as if you're commenting on Reddit:
human
Why movie review websites, like RottenTomatoes and IMDB, have vastly different scores/ratings for movies when 10's of thousands of people vote? As sample size gets bigger shouldn't they be close to each other?

Every time I go to look up reviews on a movie I got to IMDB and RottenTomatoes. Just last night we looked up reviews for "Looper" and RottenTomatoes out of 104,336 people it got an average of 4.1/5 or 87%. I wen't to IMDB and out of 128,000 it got an average of 7.8/10. What's the cause for such a big difference?

Thanks in advance for the help.
gpt
I think the answer actually has to do with how the rating systems work on both sites. IMDB takes the average score of all the votes from 1-10. This is a rating of just how good the movie was. On Rottentomatoes however, critics only have 2 options. Fresh or rotten. RT tabulates the percent of reviews considered fresh(watchable). This is more of a rating on how watchable a movie is. Therefor if 10 people gave the movie a 70% then on IMDB the score would be a 7/10 and on RT the score would be 100%.