SAT数学真题
Theleastandgreatestnumbersinalistof7realnumbersare2and20,respectively.Themedianofthel...
The least and greatest numbers in a list of 7
real numbers are 2 and 20, respectively. The median of the list is 6, and the
number 3 occurs most often in the list. Which of the following could be the
average (arithmetic mean) of the numbers in the list?
I. 7 II. 8.5 III. 10
A. I only B. I and II only C. I and III only D. II and III only E. I, II and III 展开
real numbers are 2 and 20, respectively. The median of the list is 6, and the
number 3 occurs most often in the list. Which of the following could be the
average (arithmetic mean) of the numbers in the list?
I. 7 II. 8.5 III. 10
A. I only B. I and II only C. I and III only D. II and III only E. I, II and III 展开
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答案选E 第一个是2最后一个是20第四个是6，因为3出现最多所以第二三个都是3。
假设平均值为7 七个数和为49则第六个为7第八个为8即可
假设平均值为10 17、19即可
既然7可以10可以那么8.5也可以
所以选E
假设平均值为7 七个数和为49则第六个为7第八个为8即可
假设平均值为10 17、19即可
既然7可以10可以那么8.5也可以
所以选E
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