88% if user only acts when A and B agree. When A and B disagree

The problem did not give the information on how user make decision.  There are different choices for different answers.

 

1) 88% if user only acts when A and B agree. 

2) When A and B disagree, it depends on the user.  If the user always follows A, the it is 60% overall.  If the user always follows B, then it is 70%.

3) If user only acts when A and B disagree (silly move), and randomly pick A or B, 42%.

4) If user use either A or B randomly in all cases, 65%.

所有跟帖： 

• 你该复习一下概率课程了，都还给老师了，嗬嗬！ -万枫- ♂ (0 bytes) () 11/07/2010 postreply 08:35:00

• 回复：你该复习一下概率课程了，都还给老师了，嗬嗬！ -planotx- ♂ (200 bytes) () 11/07/2010 postreply 08:54:26

• A and B agree的概率怎么会是88%？ 这两法重叠(agree)的部分只有42% -万枫- ♂ (213 bytes) () 11/07/2010 postreply 09:25:47

• The probablity of A and B agree is 0.6*0.7 + 0.3*0.4 = .54 (54%) -planotx- ♂ (64 bytes) () 11/07/2010 postreply 10:14:45

• I need to correct that if A and B agree, the correct chance is 7 -planotx- ♂ (0 bytes) () 11/07/2010 postreply 10:21:01

• 那也不会是８８％呀 -万枫- ♂ (0 bytes) () 11/07/2010 postreply 11:58:52

• yes, you are right. My post was cut -planotx- ♂ (167 bytes) () 11/07/2010 postreply 14:31:55

• 注意：准确率不是一致率，１２％是两法都错误的概率，不应该加到准确率里 -万枫- ♂ (0 bytes) () 11/07/2010 postreply 12:01:36