Answer: It depends.
Step-by-step explanation:
Each body is different. Someone's normal could be someone else's abnormal. It all depends on age, family history, genetics, all that fun stuff. If we're talking about an adult female, sometime in her 20s or 30s, the average body weight is around 170 lbs, or 77 kg. If we're talking about a teenage female, the average can be from 58-65 kg, or 128-143 lbs. There's no surefire answer, since everyone is different. But, here are some examples of averages. If you can go off of this, I'm sure it'd help.