32
37
40
43
50
【答案】 D
【思路】
Range定義=最大值-最小值
題目問說哪個最有可能是最大值,所以從最大的先推推看,遇到直接做起来难的题目,从答案分析
E)Max:50,range25代表Min=50-25=25 ==可是25又是中位數,所以不可能!!
D)Max:43,range25代表Min=43-25=18
列舉驗證一下: 18 19 20 21 22 23 24 25 ........43
總共15個,所以中位數左邊應該有7個
剛好25也是中位數,所以成立!!
因為range25,各選項間距為
=
由於15個不同的數字,此外,中位數為25=只有D選項符合
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142. 14580-!-item-!-187;#058010013 分页标题#e#
The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?
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