题目信息
The average (arithmetic mean) of the integers from 200 to 400, inclusive, is how much greater than the average of the integers from 50 to 100, inclusive?
A:150
B:175
C:200
D:225
E:300
参考答案及共享解析

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本题耗时:
已选答案:
正确答案:
D:225
*考点:计算
*解析:
200-400的平均数=(200+400)/2=300
50-100的平均数=(50+100)/2=75
答案:B 300-75=225


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