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X,81,73,71,98,73,64
What is the value of X in the above list of 7 numbers?
(1)The average (arithmetic mean) of these 7 numbers is 80.
(2)The range of these 7 numbers is 36.
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我有更好的解析 
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81+73+71+98+73+64+X=7*80
X=100
满足
98-64=34 所以有两种情况
1.98-X=36 X=62<64
2.X-64=36 X=100>98
不满足
337024ygjon
98不一定是最大的数，X有可能才是最大的数
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2021-10-03 17:33:54
CaRol666
有可能x很大，和原来最小的数形成range
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2020-08-08 21:00:18
科目：
数据充分DS
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难题300
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