I got this from my gym, this is their standards they use to evaluate folks...
Men
Low(very lean)...under 11%
Low(lean)....11-14%
Avg....15-17%
Fair...18-22%
Unhealthy....22+%
Women
Low(very lean)....under 19%
Low(lean)...19-22%
Avg.....23-27%
Fair....28-35%
Unhealthy....35+%
Again, not my figures