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  3. For a certain distribution, the measurement 12.1 is 1.5 standard deviations belo

For a certain distribution, the measurement 12.1 is 1.5 standard deviations belo

游客2025-02-23  24
问题 For a certain distribution, the measurement 12.1 is 1.5 standard deviations below the mean, and the measurement 17.5 is 3.0 standard deviations above the mean. What is the mean of the distribution?
选项 A、13.8
B、13.9
C、14.0
D、14.1
E、14.2
答案 B
解析 此题以数据分布这样一个数据分析的知识点为框架，单纯考查二元一次方程，解题的步骤和最后的结果均与数据分布无关。设mean为m，standard deviation为d，m-1.5d=12.1，m+3d=17.5。解得m=13.9，d=1.2。答案选B。
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