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问题 解答题

男生女生共有48人，男生的人数是女生的60%，男生女生各多少人？（先画出单位“1”，再列出数量关系）

答案

根据题可画图：

48÷（1+60%）

=48÷160%，

=30（人）；

48-30=18（人）；

答：女生有30人，男生有18人．

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单项选择题

An analysis determined that approximately 99 percent of the observations of daily sales for a company were within the interval from $ 250000 to $ 580000 and that daily sales for the company were normally distributed. The mean daily sales and standard deviation of daily sales, respectively, for the company were closest to: Mean daily sales Standard deviation of daily sales（）

A. $ 415000 $ 41667

B. $ 415000 $ 55000

C. $ 355115 $ 41667
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