The fraction of errors using three-sigma limits

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Using samples of 200 credit card statements, an Auditor found the following:

---Sample Number: 1    2     3     4     5     6     7   8 9    10    11   12   13   14   15

Number of Errors:    25  33   36   25   29   26   20   26    39    19   29    28    25    33   25

Determine lower and upper control limits for the fraction of errors using three-sigma limits.

Reference no: EM132185561

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