The employees in an insurance company's mailroom are responsible for sorting and delivering the incoming U.S. mail to the correct departments. These employees have been receiving numerous complaints that mail is being delivering to the wrong departments. To better understand these complaints, the mailroom employees recorded the number of these complaints they received each day for the last 20 working days (Monday through Friday for the last 4 weeks). The data, in the order of the last 20 working days, is given below. Week 1 Week 2 Week 3 Week 4 Monday 13 Monday 12 Monday 12 Monday 12 Tuesday 5 Tuesday 6 Tuesday 5 Tuesday 4 Wednesday 14 Wednesday 12 Wednesday 12 Wednesday 9 Thursday 11 Thursday 11 Thursday 9 Thursday 15 Friday 9 Friday 15 Friday 10 Friday 9 Plot these data on a run chart. What conclusion can you make about the number of complaints received over the last 4 weeks?