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There are four raingauge stations existing in the catchment of a river. The average annual rainfall values at these stations are 780, 640, 400, 520 mm. Allowable percentage error in mean value of rainfall is 10%. The optimum number of rain gauges in the catchment should be ________. 8

Answer» There are four raingauge stations existing in the catchment of a river. The average annual rainfall values at these stations are 780, 640, 400, 520 mm. Allowable percentage error in mean value of rainfall is 10%. The optimum number of rain gauges in the catchment should be ________.
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