It isn't hard to understand that some people are extremely extroverted. Or extremely introverted. I know a few.
But how about people, like me, that have more or less 50 percent extroversion and introversion? I like to be alone and charge myself in silence, but I also like to be among other people and I really enjoy them. I have done a lot of MBTI-tests over a period of 5 years, and on average my score is 50/50. I even have typed myself terrible wrong in the beginning, but E and I were always equally.
So in addition to this, in terms of MBTI it is hard to tell if my primary cognitive process is E or I.
What is known about 50/50 Extroversion / Introversion?