淘豆网
下载此文档放大查看缩小查看   1/8
0/100
您的浏览器不支持进度条
更多>>该用户其他文档
下载所得到的文件列表
环境规划与管理作业答案.docx
文档介绍:
环境规划与管理第四章、环境规划与管理的数学基础1、计算下面数据的各种平均值、标准差、算术平均误差和级差。.83,0.76,0.89,0.73,0.92,0.81,0.92,0.75,0.88,0.79,0.90,0.84解:算数平均值:å xi-x =x1 + x2 + ......  + xnn=ni=1n=0.83 + 0.76 + 0.89 + 0.73 + 0.92 + 0.81 + 0.92 + 0.75 + 0.88 + 0.79 + 0.90 + 0.8412= 0.835加权平均值:w x  + w2 x2 + ...... + wn xnw1 +w2 +...... + wnå w xå wi-xw = 1 1=ni=1ini-1i=0.83 + 0.76 + 0.89 + 0.73 + 0.92 ´ 2 + 0.81 + 0.75 + 0.88 + 0.79 + 0.90 + 0.8412= 0.835几何平均值:-xG = n x1x2 × × × xn= 12 0.83 ´ 0.76 ´ 0.89 ´ 0.73 ´ 0.92 ´ 0.81´ 0.92 ´ 0.75 ´ 0.88 ´ 0.79 ´ 0.90 ´ 0.84= 0.832调和平均值:1-xH =nnåi-1 xi+=10.83+10.76+10.89+10.73+10.92+1210.8110.92+10.75+10.88+10.79+10.90+10.84= 0.830标准差:å=i  1 (xi - x)2s =1n - 1n -112 - 1(0.83 - 0.835)2 + (0.76 - 0.835)2 + (0.89 - 0.835)2 + (0.73 - 0.835)2 + (0.92 - 0.835)2 += (0.81 - 0.835)2 + (0.92 - o.835)2 + (0.75 - 0.835)2 + (0.88 - 0.835)2 + (0.79 - 0.835)2 +(0.90 - 0.935)2 + (0.84 - 0.835)2= 0.0676算数平均误差:å xDx =ni=1in-- x=0.83 - 0.835 + 0.76 - 0.835 + 0.89 - 0.835 + 0.73 - 0.835 + 0.92 - 0.835 + 0.81 - 0.835+ 0.92 - 0.835 + 0.75 - 0.835 + 0.88 - 0.835 + 0.79 - 0.835 + 0.90 - 0.835 + 0.84 - 0.83512R = max { k }- min { k }= 0.92 - 0.73 = 0.19= 0.057级差:1£k£n2、对某合金中铜的含量进行测定,不同的人员测定的数据为6.91,57.13,57.21,57.36,57.41,58.49,58.56,59.11,59.76,60.31,试用格拉布斯准则检验是否有应舍去的数据。解:算术平均值:x  + x2 + ...... + xnå xi-x = 1n=ni=1n= 58.225标准差:å=i  1 (xi - x) 2  = 1.2s =1n -1 内容来自淘豆网www.taodocs.com转载请标明出处.