That is the average weight of a 52 girl?
It seems average female weight (adult) is between 138 - 164 lbs.
Well it depends how tall you are. The average height range for an 11-year-old girl is about 52 inches (132 cm) and the average weight range for that height is 79.2 pounds (about 36 kilograms). For more information about weight in relation to your height and body composition, please see the page link, further down this page, listed under "Related Questions."