I am not quite sure but i was wandering the same thing one day and i googled it. There were a lot of helpful websites that have charts to tell you the average weights and if you are under or overweight.
If for a male the average weight is 150-160, for a female it may be around 130-150. People come in different sizes, and it does not matter how much you weigh if you have a good body.
Im 5'7" and im 140.
About 1.5 kg
145
110 pounda
6 Foot 1 Inch
125 pounds i think
87 lbs
80kg
check his BMI
100-155
60
You would probaly be about 115 pounds
139 lbs - 150 lbs