yup, Paris is a pretty average 25" tall, but she *pushes* to get to about 40lb on a good day, if I don't keep right ontop of her eating then she's down at more like 38 or less. She's definitely light in condition, and I'd like her with a little more covering, but she's not skinny anymore.
But yeah, I know other 25" poodles can easily be much much heavier without being fat too! And different lines mature at different rates too, some grow fast early on and then slow right down, others stay tiny for what seems like ages until they become their full size eventually!
Taking all of that into consideration, I don't think you could ever really generalize to form a chart!!