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The figure above shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution corresponding to the six regions shown.

The lengths of phone calls made on a certain weekend by students at High School H are approximately normally distributed with a mean of 30 minutes and a standard deviation of 10 minutes. Which of the following statements must be true?

Indicate all such statements.

A.The range of the lengths of the phone calls is less than 60 minutes.
B.The lengths of half of the phone calls are each greater than 40 minutes.
C.The length of a 35-minute phone call is 0.5 standard deviation from the mean of the lengths of the phone calls.

C显示答案

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· 相关考点

5.3.2 正态分布 5.3.1 数据分布的描述

5.3.2 正态分布

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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