Who wants to go for average anymore. A lot of kids are obese. So average will be skewed. We should aim for ideal. My 10 year old son is 4'8" and weighs 90lbs. He's got a bit of chubbiness to him but not too bad. I think ideal for this age and height would be about 80-85lbs.
85 lbs.
130 Pounds
35-37 lbs
the weight he should weigh is 105 pounds
Probably 120 will be the best weight for your height.
150 pounds
90 pounds
85 pounds
About 95-100 lb.
4 ' 0 , 30 kg.
120-140 pounds
70ish