A.93%~95% B.95%~98% C.98%~100% D.96%~98%
A.1:3 B.1:2 C.1:2.5 D.1:1
A.随机取样 B.分层分段取样 C.分层分段后再随机取样 D.梅花形取样
A.1.91 B.1.83 C.1.87 D.1.98
A.0.5 B.0.8 C.1.0 D.1.5