The watershed of a stream has five rain gauge stations inside the basin. When Thiessen polygons were constructed, three more stations lying outside the watershed were found to have weightages. The details of Thiessen polygons surroundings each rain gauge and the recordings of the rain gauges in the month of July 2012 are given below:  Rain gauge station  A  B  C  D  E  F  G  H  Thiessen Polygon area (km2 )  720  1380  1440  1040  900  2220  419  1456  Recorded rainfall in mm during July 2012  135  143  173  128  102  115  99  110  Stations B, E and H are outside the watershed. Determine the average depth of rainfall on the watershed in July 2012 by   (i) arithmetic mean method, and   (ii) Thiessen mean method.

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