|A distribution of heights of a company of American civil war solders, showing an average height of about 5'10".|
Statistically, the average or blend of a given population for a given trait or look tends to be found the most visually appealing or attractive; the following, e.g., shows morphs of a selection of 30 HotOrNot.com photos, morphed into 1-10 scale physical attractiveness ranking tiers, along with a morph of the average of all 30 photos, which shows that the "average" morphology tends to be as attractive as the individually selected most attractive person (or morph photo):
In human chemistry, averageness is theorized to be one of the measurable components of the enthalpy factors of the human chemical bond. 
1. Rhodes, Gillian; Zebrowitz, Leslie, A. (2002). Facial Attractiveness - Evolutionary, Cognitive, and Social Perspectives (averageness as fundamental, pgs. 21, 28; average faces, attractiveness of, pgs. 61-62, etc.). Ablex.
2. (a) Thims, Libb. (2007). Human Chemistry (Volume One) (averageness, pgs. 97, 148-49, 271, 327; averageness factor, pg. 150) (preview), (Google books). Morrisville, NC: LuLu.
(b) Thims, Libb. (2007). Human Chemistry (Volume Two) (averageness, pgs. 390, 500) (preview), (Google books). Morrisville, NC: LuLu.
● Averageness – Wikipedia.