A distributor of electrical switches is interested in implementing a total quality program. The following data is collected about the organization's receiving process.

Date Packing slips Number of Errors

21 January 73 7

22 January 79 13

23 January 87 15

24 January 84 3

25 January 92 23

The number of packing slips is expected to be varying each day. Set up appropriate 3-standard deviation control limits for the problem.

Is the process in control during the (above) dates of 21 January through 25 January? Explain.