数学题干 求解释

linmeimeiei

谁能帮俺翻译一下这个题啊，硬是没看懂？“Amy‘s grade was the 90th percentile of the 80 grades for her class。Of the 100 grades from another class, 19 were higher than Amy's, and the rest were lower. If no other grade was the same as Amy's grade ,the Amy's grade was what percentile of two classes combined?”

sherryke

这题是DS么？

bennywang

90th percentile of the 80 grades for her class:就是说比同班90%人分数高
Of the 100 grades from another class, 19 were higher than Amy's: 另外一班19人比她高剩下比她底
问你两班起来后amy的percentile

linmeimeiei

不是啊  ps啦