Like 150-160 pounds. I'm fairly skinny and don't have an uber amount of muscle.
6'5 and weighing only 150 already gives you an advantage since you are so tall and are light as a feather. You don't really need to add muscle mass to jump higher, although muscle mass does come with explosive training. Honestly 10 pounds will effect your jumping ability noticeably. Just strengthen up your legs and start plyometrics. If you've never worked out your legs before your going to see a dramatic increase in your jumping ability and fast, seeing how you can only touch rim given your stats.
Good luck and tell me how it goes after a few weeks


















