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Six raingauge stations were located in a basin. The normal annual rainfall depths at the stations recorded were 42.4, 53.6, 67.8, 78.5, 82.7 and 95.5

Six raingauge stations were located in a basin. The normal annual rainfall depths at the stations recorded were 42.4, 53.6, 67.8, 78.5, 82.7 and 95.5 cm, respectively. Determine the optimum number of raingauge stations to be established in this basin, if it is desired to limit the error in the mean value of rainfall to 5%.

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