If 'p' is the precipitation, 'a' is the area represented by a rainguage, and n is the number of raingauges in a catchment area, then the weighted mean rainfall is

If 'p' is the precipitation, 'a' is the area represented by a rainguag

1.	If 'p' is the precipitation, 'a' is the area represented by a rainguage, and n is the number of raingauges in a catchment area, then the weighted mean rainfall is
A.	[A].
B.	[B].
C.	[C].
D.	[D].
Answer» D. [D].

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If 'p' is the precipitation, 'a' is the area represented by a rainguage, and n is the number of raingauges in a catchment area, then the weighted mean rainfall is

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