由已知中公司25名雇员,他们的工资情况 我们可得这25个人的工资如下所示: 135.0,95.0,80.0,80.0,70.0,60.0,60.0,60.0,52.0,52.0,52.0,52.0,40.0,31.0,31.0,31.0, 31.0,31.0,31.0,31.0,31.0,31.0,31.0,31.0,31.0, 故其年薪的平均数是 (135.0+95.0+80.0+80.0+70.0+3×60.0+4×52.0+40.0+12×31.0)÷25=650.25, 方差S2=[(135-50.4)2+(95-50.4)2+2(80-50.4)2+(70-50.4)2+3(60-50.4)2+4(52-50.4)2+(40-50.4)2+12(31-50.4)2]÷25=25.5, 标准差s=25.5. 故答案为:25.5. |