题库搜索>问题求解PS-17904
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The table above shows the number of residents in each of two age groups who support the use of each type of funding for a city initiative. What is the probability that a person randomly selected from among the 250 residents polled is younger than 40, or supports a type of funding that indudes a tax, or both?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
我有更好的解析 
暂无雷哥网文字解析
把这个表格当作韦恩图，问题是“younger than 40, or supports a type of funding that indudes a tax, or both”占比多少？及问A U B的占比。在表中圈范围，圈出来，就是除了100意外的数字。所以占比=1-100/250=150/250=3/5
rhetoric
or是并集
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2022-11-26 16:53:20
欢乐多
is younger than 40, 20+30+30=80 or supports a type of funding that indudes a tax, or both? 10+60=70 总数250， （80+70）/250=3/5
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2022-07-21 17:21:33
337024ygjon
or是并集的意思，要记住啊
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2021-09-29 22:29:22
Lori88
完全没有反应过来or是什么意思。原来就是 U 啊，用韦恩图就好了啊，哭死！！
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2021-08-22 00:38:03
236597re
8/25+12/25-5/25， U（ AUB）
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2020-07-14 12:56:14
412048id
这题没人错么？哪位大神解释一下啊？
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2020-06-01 12:01:45
如果有时间的话我也能做对回复 412048id
花了10分钟算了一堆数字都不像答案，因为问的是三种可能性相加相乘都没在答案里，备选只有3/5和4/5了，然后实在没办法了，看到框框里有个100，也不像答案，那就把这个100看成答案范围外的，答案范围就选3/5吧。这样都蒙错的话那我也没招了。
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2021-07-30 09:01:48
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问题求解PS
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