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  3. The numbers in the list above are ordered from least to greatest. If the median is one greater than the arithmetic mean, what is

The numbers in the list above are ordered from least to greatest. If the median is one greater than the arithmetic mean, what is

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问题 The numbers in the list above are ordered from least to greatest. If the median is one greater than the arithmetic mean, what is the value of?
选项 A、11
B、12
C、10
D、13
E、15
答案A
解析 5个数已经从小到大排列，因此median=10，mean=(3+6+10+y+15)/5。因为mean+1=median，由(3+6+10+y+15)/5+1=10，得到y=11。
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