A Quality Analyst wants to construct a control chart for determining whether errors in bank transactions are under control. She looked at samples of 1000 transactions each week, for four weeks in a row. A transaction was considered defective, if the analyst detected any error in the transaction.

Week Total Defectives

1 50

2 27

3 15

4 35

What are the upper and lower control limits for this control chart, using 3 sigma control limits?

None of the other options are correct .0428 and .0206

.0487 and .0153

.3495 and .2905

.0364 and .2757