题目内容

在一个均值为500,标准差为100的样本中,数值450的z-分数是______

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如果事件A与B满足P(A) = 0.4,P(B) = 0.5, 且P(A∩B) = 0.1。则P(A|B) = ______

某种瓶装液体平均灌装重量是10千克,标准差是0.5千克,根据切比雪夫法则,一批该产品灌装重量为9~11千克的数量占该批产品数量的比例约为______ 。

一组数据集,如果均值

Which of the following is appropriate for displaying data collected on the different brands of cars students at a major university drive? ( )

A. Pareto chart
B. B. two-way classification table
C. histogram
D. D. scatter plot