题目内容

正态分布曲线在均值处达到最大值。( )

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标准正态分布的期望和方差等于1。( )

The amount of time a student spent studying for an exam is an example ofa continuous variable. ( )

一个简单随机样本的数据为5,6,5,8,5,9,则该组数据的众数为______ 。

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A. mean equals the standard deviation.
B. median equals the standard deviation.
C. mean equals the variance.
D. median equals the variance.