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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
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
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
337024ygjon
or是并集的意思,要记住啊
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!!
236597re
8/25+12/25-5/25, U( AUB)
412048id
这题没人错么?哪位大神解释一下啊?
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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