Not 83! It depends! Are you a nine year old? Or 13 years old? It varies!
9 can be about 60-82lbs
10 can be about 66-85lbs
11 can be about 70-91lbs
12 can be about 80-95lbs
13 can be about 85-103lbs
Don't really rely your life on this and say "OMG im too heavy!" These are approximations, and estimations, I didn't get this from actual data, its off of knowledge of data (lol). Notice this:
Usually someone 4'9" should not weight less than 62lbs or more than 100lbs, varying by age. You can't expect a 13 year old of the same height as a nine year old to be the same weight! The thirteen year old has four extra years of food in him! It's just virtually impossible. :P
check his BMI
60
139 lbs - 150 lbs
105 pounds
130 Pounds
The average weight for a 5-6 foot male is between 120-125 pounds.
A boy that is 4 foot 9 inch should weigh between 30 to 40 kilograms. This is the ideal weight but it varies in most cases.
50 pounds
The weight for a 57 inch tall boy is about 97 pounds
95lb (43kg)
90-110 don't be anerexic
about 30 pounds