For a standing jump at the high school level, 21-24 is considered to be very good for girls at least 15-years old. 17-20 is average to slightly above average. 13-16 is getting pretty bad. Below that and you need to start cross-country. Most of my work is with volleyball players so obviously we need to consider the nature of their sport.
Also what needs to be considered is what is the height necessary to be successful. For instance, net height for volleyball is about 8 feet and to hit well at the varsity level, you’ve got to be at least 8’6" to 9’0" hitting (depending on style/technique). So for a max. height jump (for VB players an approach jump), minimum jump height for an elite outside hitter should be around 9’6". That way you avoid giving too much credit to the girl who’s 5’-nothing but has a 24" jump (which only goes to around 9’0 to 9’2" depending on reach, on average).