a) Weekly demand for a product over the past 6 weeks is given in Table 1.

Table 1. Actual demand

Week	1	2	3	4	5	6
Value	20	12	19	17	18	15

Use a three-week moving average to calculate the forecasts for weeks 4, 5, and 6.

b. A logistics company is responsible for transporting finished products from a wholesaler in city A to a retailer in city E. The network in Figure 3 shows other cities, i.e. B, C, and D, located between those two cities, their road connections, and the length in kilometers. All roads allow two-way traffic. Implement a suitable algorithm to find the shortest path from city A to city E.