例：在相同的条件下对某试样中镍的质量分数(%) 进行90次测定结果 1.601.671.671.641.581.641.671.601.571.60 1.591.641.741.651.641.611.651.691.641.63 1.651.701.631.621.701.651.681.661.691.60 1.701.631.671.701.701.631.571.591.621.60 1.531.561.581.601.581.591.611.621.551.52 1.491.561.571.611.611.611.501.531.531.59 1.661.631.541.661.641.641.641.621.621.65 1.601.631.621.611.651.611.641.631.541.61 1.601.641.651.591.581.591.601.671.681.69 19 19 例：在相同的条件下对某试样中镍的质量分数(%) 进行90次测定结果 1.60 1.67 1.67 1.64 1.58 1.64 1.67 1.60 1.57 1.60 1.59 1.64 1.74 1.65 1.64 1.61 1.65 1.69 1.64 1.63 1.65 1.70 1.63 1.62 1.70 1.65 1.68 1.66 1.69 1.60 1.70 1.63 1.67 1.70 1.70 1.63 1.57 1.59 1.62 1.60 1.53 1.56 1.58 1.60 1.58 1.59 1.61 1.62 1.55 1.52 1.49 1.56 1.57 1.61 1.61 1.61 1.50 1.53 1.53 1.59 1.66 1.63 1.54 1.66 1.64 1.64 1.64 1.62 1.62 1.65 1.60 1.63 1.62 1.61 1.65 1.61 1.64 1.63 1.54 1.61 1.60 1.64 1.65 1.59 1.58 1.59 1.60 1.67 1.68 1.69