(b) Calculate the Thiessen weighted average precipitation by the following steps:(i) Complete Figure 7.3 by joining the remaining rain gauge locations (betweenC and E) with dashed lines and drawing perpendicular bisectors for each(solid lines). Then, extend and join the perpendiculars to form polygons; thepolygon boundaries should extend a short distance beyond the basin divide.Most of them have already been done for you.(ii) Calculate the proportion of the total basin area that each polygon cov