If a certain sample of data has a mean of 20.0 and astandard deviation of 3.0, which of the following values is more than 2.5 standard deviations from the mean?
12.0
13.5
17.0
23.5
26.5
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注意：more than 2.5个标准差！！！是more than！！
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注意：more than 2.5个标准差！！！是more than！！
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