y********i 发帖数: 2 | 1 题目如下
一乘客问空姐,一个恐怖分子带炸弹上飞机的概率是多少?空姐答:百万分之一。乘客
又问,那正巧两个恐怖分子带炸弹上飞机的概率是多少?空姐答:那可要千万分之一了。
次日,这位乘客携炸弹上飞机。被警察抓住,询问。乘客问答:为了减低被炸死的概率。
问这位乘客犯了哪些概率学错误? |
a**e 发帖数: 5794 | 2 犯错误的是空姐
了。
率。
【在 y********i 的大作中提到】 : 题目如下 : 一乘客问空姐,一个恐怖分子带炸弹上飞机的概率是多少?空姐答:百万分之一。乘客 : 又问,那正巧两个恐怖分子带炸弹上飞机的概率是多少?空姐答:那可要千万分之一了。 : 次日,这位乘客携炸弹上飞机。被警察抓住,询问。乘客问答:为了减低被炸死的概率。 : 问这位乘客犯了哪些概率学错误?
|
s*x 发帖数: 3328 | 3 haha
了。
率。
【在 y********i 的大作中提到】 : 题目如下 : 一乘客问空姐,一个恐怖分子带炸弹上飞机的概率是多少?空姐答:百万分之一。乘客 : 又问,那正巧两个恐怖分子带炸弹上飞机的概率是多少?空姐答:那可要千万分之一了。 : 次日,这位乘客携炸弹上飞机。被警察抓住,询问。乘客问答:为了减低被炸死的概率。 : 问这位乘客犯了哪些概率学错误?
|
a****0 发帖数: 22 | 4 空姐不一定犯错误吧
【在 a**e 的大作中提到】 : 犯错误的是空姐 : : 了。 : 率。
|
e****d 发帖数: 333 | 5 This is a conditional probability.
A=the passenger brings a bomb with himself.
B=the passenger meets terrorists who bring a bomb.
Then what the passenger was doing is described by the conditional probability:
P(B|A).
Namely, given the fact that passenger himself has a bomb, what is the probability of meeting terroriests' bomb.
A very simple straight forward calculation shows
P(B|A)=P(B,A)/P(A)
Actually, A and B are independent assuming the passenger himself is not a terrorist.
So P(B,A)=P(B)*P(A |
y********i 发帖数: 2 | 6 Perfect!
Thank you
probability:
probability of meeting terroriests' bomb.
terrorist.
【在 e****d 的大作中提到】 : This is a conditional probability. : A=the passenger brings a bomb with himself. : B=the passenger meets terrorists who bring a bomb. : Then what the passenger was doing is described by the conditional probability: : P(B|A). : Namely, given the fact that passenger himself has a bomb, what is the probability of meeting terroriests' bomb. : A very simple straight forward calculation shows : P(B|A)=P(B,A)/P(A) : Actually, A and B are independent assuming the passenger himself is not a terrorist. : So P(B,A)=P(B)*P(A
|
k******h 发帖数: 4 | |
S*******s 发帖数: 13043 | 8 没有人犯错误。正因为像他这样业余水平的人会被抓住,带炸弹上飞机的概率才是百万
分之一 |