A catchment has eight raingauge stations. In a year, the annual rainfall recorded by the gauges (in cm) are 93.8,106.5,170.6,138.7,87.8,156.2,180.9 and $110.3 .$ For a $10 \%$ error in the estimation of the mean rainfall, the optimum number of stations in the catchment is

(A) 4

(B) 6

(C) 8

(D) 10

A catchment has eight raingauge stations. In a year, the annual rainfall recorded by the gauges (in cm) are 93.8,106.5,170.6,138.7,87.8,156.2,180.9 and $110.3 .$ For a $10 \%$ error in the estimation of the mean rainfall, the optimum number of stations in the catchment is

(A) 4

(B) 6

(C) 8

(D) 10

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