Amy's grade was the 90th percentile of the 80 grades forher class. Of the 100 grades fromanother class, 19 were higher than Amy's, and the rest were lower. If no other grade was the same as Amy'sgrade, then Amy's grade was what percentile of the grades of the two classescombined (A) 72nd (B) 80th (C) 81st (D) 85th (E) 92nd
题目不难，加权就能解答出来 只是题目里面那个90th percentile of the 80 grades for her class怎么理解阿 问题比较菜，希望有人回答一下
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2011-10-20 05:51:59
收藏
收藏
