2 NEW ! 英文数学问题 请数学高手帮帮我解答 >< 给十分 (不是要翻译 需要解答)
以下是我不会的英文数学问题厉害的高手请帮我解答一下问题拜托了1.Thefollowingtableprovidedsomeinformationaboutthesexan...
以下是我不会的英文数学问题 厉害的高手 请帮我解答一下问题 拜托了
1. The following table provided some information about the sex and level of the 80 students in a dance school.
Beginner , intermediate , advanced , total
Women ? ? ? 64
Man 4 8 4 16
One of the 80 students in this school is chosen at random, given that the student chosen is a women , the probability that she is at the intermediate level is 25%.
How many women in this dance school are at the intermediate level ?
2. A study of the 900 students in a school revealed the following information:
- There are 400 girls in this school.
- If one student is chosen at random , the probability that the student subscribes to the internet is 70%.
- If one student is chosen at random from among those who do not subscribe to the internet , the probability of choosing is 1/3 .
How many boys in this school are internet subscribe ?
(make a contingency table to solve)
请给我解答答案的过程 (算式) 还有问号 数字是什麼 展开
1. The following table provided some information about the sex and level of the 80 students in a dance school.
Beginner , intermediate , advanced , total
Women ? ? ? 64
Man 4 8 4 16
One of the 80 students in this school is chosen at random, given that the student chosen is a women , the probability that she is at the intermediate level is 25%.
How many women in this dance school are at the intermediate level ?
2. A study of the 900 students in a school revealed the following information:
- There are 400 girls in this school.
- If one student is chosen at random , the probability that the student subscribes to the internet is 70%.
- If one student is chosen at random from among those who do not subscribe to the internet , the probability of choosing is 1/3 .
How many boys in this school are internet subscribe ?
(make a contingency table to solve)
请给我解答答案的过程 (算式) 还有问号 数字是什麼 展开
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1,由 given that the student chosen is a women 可以得知应从64个女生中选择,又因为占%25,所以应为16个
2,(不好意思,没算出来,不过你看一下式子有没有问题!)
subscribes to the internet是支持网络的意思
由题意
If one student is chosen at random , the probability that the student subscribes to the internet is 70%.
- If one student is chosen at random from among those who do not subscribe to the internet , the probability of choosing is 1/3 .
可知女生中支持网络的占总人数的70%,不支持的占总人数1/3
又知总人数为900 由此可列一个二元一次方程组 设总人数中支持的为x,不支持的为y(注意设的是总人数中!)
x+y=900,
x*70%+y*1/3=400
晕!没算出整数
不知咋回事,自己看看吧
则有 x+y=900
2,(不好意思,没算出来,不过你看一下式子有没有问题!)
subscribes to the internet是支持网络的意思
由题意
If one student is chosen at random , the probability that the student subscribes to the internet is 70%.
- If one student is chosen at random from among those who do not subscribe to the internet , the probability of choosing is 1/3 .
可知女生中支持网络的占总人数的70%,不支持的占总人数1/3
又知总人数为900 由此可列一个二元一次方程组 设总人数中支持的为x,不支持的为y(注意设的是总人数中!)
x+y=900,
x*70%+y*1/3=400
晕!没算出整数
不知咋回事,自己看看吧
则有 x+y=900
展开全部
第一题 答案是12
第二题
第一问 350
第二问 200
第二题
第一问 350
第二问 200
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题看懂了的话就很简单阿。
女生有64个 是intermidate的可能性是0.25 那就一共有16个female intermidate.
第二题不明确。student是男是女?
女生有64个 是intermidate的可能性是0.25 那就一共有16个female intermidate.
第二题不明确。student是男是女?
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