I always thought non-force-sensitives contain zero midi-chlorian. But, then I watched Star Wars: The Clone Wars - The Lost Missions (Unfinished season 6). In an episode, Jar-Jar was attacked for force extraction from him. Upon arguing that he wasn't force-sensitive, he got reply that everyone has small amount of Force. I don't know what containing the Force means. But, It looks like he must have midi-chlorians which is directly related with the Force sensitivity.
How many midi-chlorians can be found in a non-force-sensitive?