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排序也应该是从小到大排序吧,虽然结果是一样的??NO.PZ2015120604000045问题如下 The table below shows the monthly storeturns of Ivy Corp.Accorng to the above table, calculate the mestoreturn for Ivy Corp.?A.7.7%.B.8.0%.C.12.0%.B is correctFirstly, we rank the returns : 20% 12% 12% 4% 3% -5%.there are 6 observations, the meis the average of 12% an4%(12%+4%)/2=8%.6个数,中位点是6+1=7/2=3.5中位数=4%+(12%-4%)*(3.5-3)=8%这种方法对吗?
NO.PZ2015120604000045 问题如下 The table below shows the monthly storeturns of Ivy Corp.Accorng to the above table, calculate the mestoreturn for Ivy Corp.? A.7.7%. B.8.0%. C.12.0%. B is correctFirstly, we rank the returns : 20% 12% 12% 4% 3% -5%.there are 6 observations, the meis the average of 12% an4%(12%+4%)/2=8%. 求mean,数据个数是偶数,不应该=n+2 / 2=4 ?
me要先排序的吗,那为什么求frequency的mean不用排序,按照给定的柱状图的frequency来求了
为什么不是用分位数的公式?6乘以1/2=3.5,第三个数和第四个数是4和12,然后(12-4)乘以0.5,再加3,等于7,谢谢