Normal Distribution (Bell Curve)
A statistical pattern where most values cluster around the average, with fewer values at the extremes. Personality traits follow this pattern — most people score near the middle.
The normal distribution (bell curve) is fundamental to understanding personality test scores. When you score 72nd percentile on Extraversion, it means you're more extraverted than 72% of the population — and the bell curve shows how rare that is.
Most Big Five scores cluster between the 30th and 70th percentile (the "average" range). Scores below the 15th or above the 85th percentile are genuinely distinctive — these are the traits that define your personality's unique signature.
This is why Big Five percentile scores are more meaningful than MBTI types: MBTI assigns you to one of two categories (I or E) when the actual distribution is continuous. Someone at 49th percentile Extraversion gets labeled "Introvert" — the same label as someone at 5th percentile.