Solve Problem 3-9 in Chapter 3 to construct a c-chart to monitor late order deliveries at the Victoria Bread Company.

Problem 3-9

The Victoria Bread Company daily delivers multiple orders by truck from its regional distribution centre to stores in the T&T Supermarket chain. One measure of its supply chain performance is the number of late deliveries. The company’s goal is to make all deliveries within one day, so a delivery is late if it exceeds one day. The total number of late deliveries for each of the past 20 days are as follows:

Day                                                         Late Deliveries
1.................................................................................... 7
2 ................................................................................. 16
3 ................................................................................. 14
4 ................................................................................... 8
5 ................................................................................. 19
6 ................................................................................. 12
7 ................................................................................. 10
8 ................................................................................. 14
9 ................................................................................... 8
10 ................................................................................. 7
11 ................................................................................. 6
12 ............................................................................... 12
13 ............................................................................... 15
14 ............................................................................... 10
15 ............................................................................... 17
16 ............................................................................... 16
17 ............................................................................... 14
18 ............................................................................... 12
19 ............................................................................... 18
20 ............................................................................... 20

Construct a c-chart for late deliveries with 3σ control limits and indicate if the delivery process was out of control at any time.