Question

麻烦大家帮我翻译一下这道GRE数学题！！

In a distribution of 850 different measurements, x centimeters is at the 73rd percentile. If there are 68 measurements in the distribution that are greater than y centimeters but less than x centimeters, then y is approximately at what percentile in the distribution?

Answer 1

我理解的大意是：把一个东西分为680等分。X位于总长度73%的位置处，如果有68个等分点大于Y但是小于X，那么Y位于多少百分点处？
这个题很简单，假设总长度为1，X=0.73，Y<X-68*(1/680)=0.63 所以Y<0.63.因为Y是680个等分点的一个，所以设Y=(1/680)*m，把Y=0.63带进去，m=428.4.所以m=428.即Y=428*(1/680)=0.629411。所以Y点在总长度的62.9%处。