：find interval 很着急suppose that a large international corporation wishes to obtain its own "benchmark" for one day travel expenses in moscow.to do this .it records the one day travel expenses for a random sample of 35 executives visiting Mosco

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：find interval 很着急suppose that a large international corporation wishes to obtain its own

：find interval 很着急suppose that a large international corporation wishes to obtain its own "benchmark" for one day travel expenses in moscow.to do this .it records the one day travel expenses for a random sample of 35 executives visiting Mosco
：find interval 很着急
suppose that a large international corporation wishes to obtain its own "benchmark" for one day travel expenses in moscow.to do this .it records the one day travel expenses for a random sample of 35 executives visiting Moscow.The mean and the standard deviation of these expenses are calculated to be x =$538 and s =$41.futhermore ,a histogram shows that the expenses are approximately.
A:find an interval that we estimate contains 99.73 persent of all one day travel expenses in Moscow.
B:if an executive submits an expense of $720 for a one day stay in Moscow ,should this expense be considered unusully high?why or why not?

：find interval 很着急suppose that a large international corporation wishes to obtain its own "benchmark" for one day travel expenses in moscow.to do this .it records the one day travel expenses for a random sample of 35 executives visiting Mosco
A,这就是让你找正态分布图中间区域的区间.他的面积是99.73,那么你可以找它的一半,49.865,可以得出任意一边的空白部分面积就是0.135.然后你去附录正态分布表里这个面积值对应的Z值.这个点到(1-Z)就是关于Z的区间.中间需要X和Z的转换,这个就不用我说了吧楼主?就是套公式,z=(X-Xba)/标准差.
B,这个就是考你概念”寻常”与否的.超过两个标准差就算是不寻常.楼主可以用上面的结果尝试一下.不会再问我.

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