The following table shows the details of defective per 1000 units of tooth brush during 4 months
The following table shows the details of defective per 1000 units of tooth brush during 4 months
| Month | No. of defective products |
| Nov. 2010 | 5 |
| Dec.2010 | 6 |
| Jan.2010 | 11 |
| Feb.2011 | 4 |
The supervisor reported only the defective of Jan.2011 to top management. Explain the underlying principle behind this practice.
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