英语概率题求助!A student estimates that the probability of hispassi

来源：学生作业帮编辑：拍题作业网作业帮分类：英语作业时间：2024/05/01 03:37:59

英语概率题求助!
A student estimates that the probability of his
passing Chemistry or English is 0.8,the probability
of his passing Chemistry is 0.7,but his
probability of passing both is 0.5.What should
be his estimate of the probability of his passing
English?

P(A∪B)=P(A)+P(B)-P(A∩B)
If event A represents pass chem
event B represents pass Eng
then we have
P(A∪B)=0.8
因为是或的关系即,过化学或者过英语,即至少过一门即可
即过化学的事件发生+过英语的时间发生
=过化学的事件集并上过英语的事件集
=A∪B
P(A)=0.7
P(A∩B)=0.5
so the equation becomes
0.8=0.7+P(B)-0.5
P(B)=0.6
the probability of his passing
English is 0.6

英语概率题求助!A student estimates that the probability of hispassi 求一道概率题?what is the probability that a normal random variable 英语数学概率题帮同学问的,if the probability of successfully introducing 找句子主干The probability of the event that a givenrandom variabl 英语翻译the probability of event A is 0.3,and the probability of 单项选择一题Over a very large number of trials,the probability of 英语翻译After obtaining estimates of the A and E parameters of t 英语基础知识求助The summer of 2002,many fond memories of student lif 一道英语选择：The WHO estimates that 9,700 people will eventually d 英语用法问题The probability that there will be huge profits in the 英语翻译preliminary estimates suggest that the decline that has 求助英语改错Dear Mr.Jackson,I'm Li Hua,a student of Xinhua Middle