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 is the average sample proportion of defective transactions for all four weeks? .032 .04 .02 .30 None of the other choices are correct