Laurie Daley is examining customer service costs in the southern region of capital products. Capital Products has more than 200 separate electrical products that are sold with a six-month guarantee of full repair or replacement with a new product. when a product is returned by a customer, a service report is prepared. This service report includes details of the problem and the time and cost of resolving the problem. Weekly data for the most recent 8-week period are as follows

week customer- service department costs number of service reports

1 13700 190

2 20900 275

3 13000 115

4 18800 395

5 14000 265

6 21500 455

7 16900 340

8 21000 305