3. Consider the assembly line balancing problem represented by the network in the figure below. The performance times are shown above the nodes. 12 1 5 2 7 3 8 5 5 6 7 3 8 10 8 11 (a) Determine positional weights for each of the activities. (b) For a cycle time of 15 units, find the balance obtained using the ranked positional weight technique.