The probability of taking a red ball from B: c (4, 1)/c (10, 1) = 2/5.
Take out 1 red balls from A and put them in B. At this time, B has 1 1 balls.
The probability of B occurrence:11*1/2+4/1* 2/5 =1/22+8/55 = 21.
This is the probability of the proportional problem. explain
If there are two production lines, A and B, and A accounts for 20% of the total output, the rejection rate of A is 0.02 and that of B is 0.03, find the rejection rate of the total output:
20%*0.02+80%*0.03=0.028