Most people (more than 50%) have an above average number of legs, arms, and eyes, but a below average number of nipples. This is because having more than 2 legs

Most people (more than 50%) have an above average number of legs, arms, and eyes, but a below average number of nipples. This is because having more than 2 legs, arms, or eyes is exceedingly rare, whereas there's a small number of folks who have 1 or none, which brings the average below 2. Similarly, extra nipples are more common than losing a nipple. It's the difference between median/mode and mean.