Posted by **sam** on Wednesday, April 21, 2010 at 3:14pm.

A manufacturer produces the same kind of computer chip in two plants. In the first plant, the ratio of defective

chips to good chips is 15:100 and in the second plant, that ratio is 12:100. A buyer of a large number of

chips is aware that some come from the first plant and some from the second. However, she is not aware of how many come from each. The buyer would like to

know the ratio of defective chips to good chips in any given order. Can she determine that ratio? If so, explain

how. If not, explain why not.

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