A company that manufactures tennis balls operates three shifts each day. Based on past experience, it is known that a percentage of the balls produced will be defective. The following table shows the percentage produced on each shift and the percentage of defectives in each shift:
Shift Percentage Percentage
Produced of Defectives
1 30% 10%
2 50% 15%
3 20% 20%
If a tennis ball is chosen at random and found to be defective, what is the probability that it was produced on the first shift?
For a quite similar question (with answer), see http://www.mathhelpforum.com/math-he...tml#post128009.