The Enneagram is a system which divides all human behavior into nine personality divisions. Your main type is which ever of those nine behaviors you utilize most. Your mean type, is who you are, on average, based on the sum influence of all nine behaviors (i.e. your overall personality).
Most Enneagram books and tests focus on main type and use an additional "variant" classification (instead of mean type) to account for the influence of all nine behavior types. This is the same thing as mean typing, except instead of 9 delineations, there are only three. Mean type to variant key: Social variant = 1-3 mean types, Self Pres variant = 4-6 mean types, Sexual variant = 7-9 mean types.
1,2,3 behaviors are attention/acceptance seeking behaviors (social security). 7,8,9 behaviors are pleasure seeking behaviors (physical security). 4,5,6 are knowledge seeking behaviors (intellectual security). However, type 4 behavior is about seeking the knowledge of how to get attention and type 6 behavior is about seeking the knowledge of how to get pleasure. Now, no test or test taker is perfect but if your score is accurate then your results reflect two things. Who you try to be consciously (main type) and who you are unconciously (mean type/variant). Each of those reflects an orientation towards acceptance (1-3), pleasure (7-9), or knowledge (4-6). Only Type 5 is directly focused on gaining knowledge, all other types (main or mean) have some level of bias towards prioritizing acceptance or pleasure. At the heart of acceptance seeking behaviors is the belief that if I am attractive in some way, I will be taken care of. This results in superficial development. The problem with a pleasure bias is that it makes you more likely to be selfish and destructive because your short term pleasure is all you are tuned in on. You don't notice or care about the displeasure you might cause others or the long term pain you might be setting yourself up for. Acceptance and pleasure seeking behaviors keep people dependent. Knowledge seeking behaviors are about increasing independence, learning new and better ways to survive in life without conforming to others or taking advantage of others.