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The table above summarizes customer satisfaction ratings for two banks, where each rating is an integer from 1 to 10. Which of the following statements must be true?

Indicate all such statements.

A.For Bank I, if a rating is within 0.5 standard deviation of the mean rating, then the rating is 7.
B.For Bank Il, if a rating is within 0.4 standard deviation of the mean rating, then the rating is 6
C.The sum of all the ratings for Bank I is less than the sum of all the ratings for Bank Il.

B显示答案

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· 相关考点

5.3.1 数据分布的描述

以上解析由考满分老师提供。

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