解?$：(1)$?果農(nóng)共抽查的果樹棵數(shù):
?$48 \div \frac{4+2}{5+6+8+4+2}=48 ×\frac{25}{6} =200 \text { (棵 });$?
?$(2)$?掛果樹在?$ 40 \sim 60 $?之間的樹的棵數(shù):
?$200 ×\frac{6+8}{5+6+8+4+2}=112(\text { 棵 }) \text {, }$?
所占的百分比為?$:\frac{6+8}{5+6+8+4+2} ×100 \%=56 \% \text {. }$?
