花dnf86版本300rmbB买红51的有想买的吗???

考点:等可能事件的概率,频率分布直方图
专题:概率与统计
分析:(1)根据表格和条形统计图可得空气质量类别为中度污染的天数,然后利用古典概型的概率公式可求出所求;(2)由条形图知,空气质量类别颜色为紫色的数据有4个,分别设为a、b、c、d,空气质量类别颜色为褐红色的数据有2个,分别设为e、f,然后列举出基本事件,以及至少有一个数据反映的空气质量类别颜色为褐红色的事件,最后根据古典概型的概率公式解之即可.
解:(1)由条形统计图可知,空气质量类别为中度污染的天数为6,所以该城市本月内空气质量类别为中度污染的概率&P=630=15.(2)由条形图知,空气质量类别颜色为紫色的数据有4个,分别设为a、b、c、d,空气质量类别颜色为褐红色的数据有2个,分别设为e、f.设从以上6个数据任取2个,至少有一个数据反映的空气质量类别颜色为褐红色为事件A,则基本事件有:(a,b),(a,c),(a,d),(b,c),(b,d),(c,d),(a,e),(a,f),(b,e),(b,f),(c,e),(c,f),(d,e),(d,f),(e,f)共15种可能,A包含的基本事件有:(a,e),(a,f),(b,e),(b,f),(c,e),(c,f),(d,e),(d,f),(e,f)9种可能,故所求的概率P(A)=915=35.
点评:本题主要考查条形图,以及古典概型的概率计算,常用利用列举法进行求解,同时考查学生的阅读能力和分析问题的能力,属于基础题.
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300万买学区房还是上国际学校 哪个划算?(1)
发布时间: 11:25:55
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发布人:Tank
天价学区房,用500万换来一个重点小学的入学名额,而明星们却用20多万一年的学费为儿女做教育投资。学区房还是国际学校,在经济上看哪个更划算?
  月初,46万/平米的天价学区房引爆了2016年买房择校的高潮,用500万换来一个重点小学的入学名额,&老破小&的学区房成为家长心中公认的投资优质教育的&捷径&。
  他们说,孟母还要三迁,学区房不是买不买,而是什么时候买的问题。而另一方面,现在社会名流、演艺明星却让孩子弃传统的公立名校选择贵族国际学校,比如当年王菲女儿窦靖童,只在北京四中读书一年就转去上海就读德威国际学校。他们用20多万一年的学费 为儿女做教育投资。学区房还是国际学校,在经济上看,哪个更划算? 51offer小编下面为家长们做一个对比分析。
  中档公立教育VS中档国际学校
  公立学校
数据来源:某房地产中介,择校费来自某文库
  中档基础教育的目的就是&用钱给孩子一个良好的教育&,这里的学区房一般是10-20万元/平米,但都是胡同里面 &老破小&的一间,甚至已经不能居住。只要户口在片区,部分区立的重点小学可以通过&择校费&来解决。不过虽然政府要求学校择校费最多不可以超过3万,但 是加上中间费、占坑班、奥数班等明目繁多的费用,即使是区重点小学,择校费最高也可能超过8万元。
  国际学校
  中档国际学校一般是西式教育体系适度本土化,对户籍不再有要求,中国大陆学生的比例也一般在8成以上。但是国际学校因为没有传统的学籍、户籍要求,是没有本地户籍学生的福音。
数据来源:某学校官网

参考资料

 

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