Telemarketers for a mail-order firm are assigned to make a total of 200 calls each day, then record the number of potential customers who are interested in receiving a catalog and first-order discount coupon in the mail. For each of the past 50 days, the number of catalog/coupon packages sent is as shown here.

Construct one or more appropriate control charts and comment on the state of control of the process.

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Days Successes 1-15 21 16 23 16 22 19 23 25 15 22 17 21 21 23 15 16-30 18 20 14 24 18 18 22 27 15 13 29 18 21 21 25 31-45 20 24 15 20 21 11 19 17 22 16 17 28 23 22 16 46-50 22 18 19 15 21