平均值为：(79.4m+80.6m+80.8m+79.1m+80m+79.6m+80.5m)/7=80.0m 以平均值为标准,它们对应的数分别为 79.4m-80.0m=-0.6m 80.6m-80.0m=0.6m 80.8m-80.0m=0.8m 79.1m-80.0m=-0.9m 80m-80.0m=0m 79.6m-80.0m=-0.4m 80.5m-80.0m=0.5m
