甲、乙、丙同测真实含量为50.35%的铁矿石中的 FezO3,每人测定四次： 50.30% 50.40% 50.36% 甲 50.30% 50.30% 50.35% 50.28% 乙 丙 50.25% 50.34% 50.27% 50.23% 50.33% 平均值50.29% 50.30% 50.35% 真值 甲 丙 50.10% 50.20% 50.30% 50.40% 50.50%