这是陈向东练习册里P134第23题:It the average (arithmetic mean) of x,y,z,
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这是陈向东练习册里P134第23题:It the average (arithmetic mean) of x,y,z,5,and 7 is 8,which of the following must be true?II.at least one of x,y,and z is greater than 9.III.the range of the five numbers is 2 or more.答案是以上两个都对.我很郁闷,我觉得都不对啊:II.没有提示说x,y,z 都是整数,即使平均数8,必然x、y、z必然有一个大于8,可是可以小于9啊,如果可以不是整数的话.III.即使xyz都是整数,那么II就是对的,range是最大数与最小数之差么?那么最小的range也得是9-5=4,[em59]
![这是陈向东练习册里P134第23题:It the average (arithmetic mean) of x,y,z,](/uploads/image/z/2427849-9-9.jpg?t=%E8%BF%99%E6%98%AF%E9%99%88%E5%90%91%E4%B8%9C%E7%BB%83%E4%B9%A0%E5%86%8C%E9%87%8CP134%E7%AC%AC23%E9%A2%98%EF%BC%9AIt+the+average+%28arithmetic+mean%29+of+x%2Cy%2Cz%2C)
XYZ不一定是整数,五个数平均为8,其中两个为5,7,则三个数平均为28.28/3=9.333333.均值都大于了9,必然有一个数 是要大于9的关于第三个选项,OR~OR~OR~举个例子,“4大于或者等于1”,这个结论是对的.查看原帖
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