GRE数学考试真题及解析(8)

　　In a data set of 10,000 numbers varying from 20 to 80,the number 62 is the 60th percentile and the number 74 is the nth percentile.

　　QuantityA Quantity B

　　n 70

　　A. Quantity A is greater.

　　B. Quantity B is greater.

　　C. The two quantities are equal.

　　D. The relationship cannot be determined from theinformation given.

　　解析

　　答案：D

　　注意这个题没有说这10000个数字是均匀分布的，所以nth 和70的大小是无法比较的。