應用嘅probability就係考埋解題能力……
唔加果句樓豬咪攞零分
我有啲懷疑老師唔識英文
Why13579
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唔會，其他probability 題都係咁
屌你老母冚家剷，你真係弱智到仆街兼死都唔肯認，已知冇可能既野唔應該納入可能性係常識，洗唔洗加埋你老母做雞，你有性病依啲可能性落去呀
year1 sem2
乜撚樣其他probability 題都係咁
我覺得你先係死嘈果個喎
Your neighbour has 2 children. You learn that he has a son, joe. What is the probability that joe’s sibling is a brother?
The probability that Joe's sibling is a brother is 1/2 or 0.5.
Assuming that gender is equally likely at birth, there are two equally likely possibilities for the gender of Joe's sibling: male or female. Given that Joe is a male, the gender of his sibling is independent of his gender, so the probability that Joe's sibling is also male is simply the probability that a random child in the family is male, which is 1/2 or 0.5.
My teacher said the answer is 0.75, in what circumstances we can get this answer?
The answer of 0.75 would be obtained if the question was phrased slightly differently, for example:
Your neighbor has 2 children, and tells you that at least one of them is a boy named Joe. What is the probability that Joe's sibling is a brother?
In this scenario, there are three equally likely possibilities for the genders of the two children:
Joe has a brother and a sister
Joe has a brother but no sister
Joe has a sister but no brother
We know that Joe is a boy, so the third possibility can be eliminated. This leaves us with two equally likely possibilities, one of which has Joe's sibling as a brother. Therefore, the probability that Joe's sibling is a brother is 1/2, or 0.5.
However, we are given the additional information that one of the children is named Joe. This means that the first possibility (Joe has a brother and a sister) can be eliminated as well, since we know that Joe is one of the children. This leaves us with only two possibilities, one of which has Joe's sibling as a brother. Therefore, the probability that Joe's sibling is a brother is 0.75.
So the answer of 0.75 would be correct if the question specified that we know one of the children is named Joe. If we only know that the neighbor has 2 children and one of them is a boy named Joe, then the probability of Joe's sibling being a brother would be 0.5.
The probability that Joe's sibling is a brother is 1/2 or 0.5.
Assuming that gender is equally likely at birth, there are two equally likely possibilities for the gender of Joe's sibling: male or female. Given that Joe is a male, the gender of his sibling is independent of his gender, so the probability that Joe's sibling is also male is simply the probability that a random child in the family is male, which is 1/2 or 0.5.
My teacher said the answer is 0.75, in what circumstances we can get this answer?
The answer of 0.75 would be obtained if the question was phrased slightly differently, for example:
Your neighbor has 2 children, and tells you that at least one of them is a boy named Joe. What is the probability that Joe's sibling is a brother?
In this scenario, there are three equally likely possibilities for the genders of the two children:
Joe has a brother and a sister
Joe has a brother but no sister
Joe has a sister but no brother
We know that Joe is a boy, so the third possibility can be eliminated. This leaves us with two equally likely possibilities, one of which has Joe's sibling as a brother. Therefore, the probability that Joe's sibling is a brother is 1/2, or 0.5.
However, we are given the additional information that one of the children is named Joe. This means that the first possibility (Joe has a brother and a sister) can be eliminated as well, since we know that Joe is one of the children. This leaves us with only two possibilities, one of which has Joe's sibling as a brother. Therefore, the probability that Joe's sibling is a brother is 0.75.
So the answer of 0.75 would be correct if the question specified that we know one of the children is named Joe. If we only know that the neighbor has 2 children and one of them is a boy named Joe, then the probability of Joe's sibling being a brother would be 0.5.
分別係"Joe"係咪一個fixed person (即係係咪鳩抽咁岩抽中左一條友叫呀Joe)
unfixed就1/3, fixed就1/2
unfixed就1/3, fixed就1/2
最基本已知冇可能既野唔應該納入可能性你都可以反對
我估你個 1/2 嘅意義唔係假設有一個仔係Joe，另一個係男嘅機會率
而係，一個小朋友係男嘅機會率？
如果你有解釋過就話我知第幾個留言
而係，一個小朋友係男嘅機會率？
如果你有解釋過就話我知第幾個留言
我要睇邊個留言
畀我了解一下？
畀我了解一下？
#148
上連登講有咩用 係緊張既就即係返學校搞啦
係緊張既就即係返學校搞啦如果係1/3 咁其實個答案同普通問生兩個仔女 兩個都係男嘅機會係一樣?
前設話咗joe係男，所有無joe係男既選擇都唔會計，即係我都唔會加埋你老母做雞依個選擇落去
雖然你計到個正確答案, 但計法唔啱
2個小朋友既男女組合有4個
已知其中一個係仔, 即係組合得返3個
所以BB既機率係1/3
2個小朋友既男女組合有4個
已知其中一個係仔, 即係組合得返3個
所以BB既機率係1/3
Current population
8,060,951,822
Current male population (50.5%)
4,067,195,095
Current female population (49.5%)
3,993,756,727
The Global sex ratio is 1.018.
所以唔係1/2
因為而家黎講 生男既機會係大過女少少
8,060,951,822
Current male population (50.5%)
4,067,195,095
Current female population (49.5%)
3,993,756,727
The Global sex ratio is 1.018.
所以唔係1/2
因為而家黎講 生男既機會係大過女少少
已知擲出一次正面的情形下，即係分咗先後
但joe無分係大佬定細佬
但joe無分係大佬定細佬
咁我問你啦 同你玩公字, 第一舖開字, 會唔會影響之後果舖開公定字既概率?