题目来源
题目来源1 : OG-第2版
题目来源2 : The Princeton Review
正确率：87%
难度：2
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List X and list Y each contain 60 numbers. Frequency distributions for each list are given above. The average (arithmetic mean) of the numbers in list X is 2.7, and the average of the numbers in list Y is 7.1. List Z contains 120 numbers: the 60 numbers in list X and the 60 numbers in list Y.
Quantity A
The average of the 120 numbers in list Z
Quantity B
The median of the 120 numbers in list Z
B显示答案
以上解析由 考满分老师提供。
