Construct a PERT network from the following table. Find the critical path and variance for each event, if to, tp, and to represent most optimistic, most pessimistic, and most likely times respectively. Activity 1-2 1-3 2-4 2-5 3-4 to tp tm 1 431 193 3 713 1537 275 7 3-6 4-5 4-6 5-7 922 223 663 6 6 123 6-7 7 6 2

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Mapping

Mapping is the process of representing the surface of the earth, objects on it, and the relative positions of the objects, to a suitable scale. In mapping, a large area of land is measured, surveyed, and plotted. The details of the objects present in the nearby surrounding area are located using conventional signs. All these processes are carried out on a flat paper known as a map.