概率论期中考试

 

3.The probability that a regularly scheduled flight departs on time is P(D)=0.83; the probability that it arrives on time is P(A)=0.82; and the probability that it departs and arrives on time is P(D ∩ A)=0.78. Find the probability that a plane

(a) arrives on time, given that it departed on time

(b) departed on time, given that it has arrived on time

(c)  find the probability that it arrives on time,given that it did not depart on time

　　　　

 

4.

有个陷阱：

如果是department 即  f(x) ！= g(x) * y(x) 的话，才会有有+8cox(X,Y)这一步

 

 

 

 

 

 

 

7.

 

 

 

8

 

 

和第四题的第二问一样

 

 

9.

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转载于:https://www.cnblogs.com/vocoub/p/10793220.html