Question: A process has four steps. At each step a number of units are found to be defective and are discarded from the process. The table
A process has four steps. At each step a number of units are found to be defective and are discarded from the process. The table below shows the yield rate for each step:
| Steps | Attrition |
| Step 1 | 90% |
| Step 2 | 85% |
| Step 3 | 70% |
| Step 4 | 85% |
How many units should be processed at step 1 for the process to make 20 good unit?
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