The coefficient of variation of the rainfall for six rain gauge stations in catchments was found to be 29.54%. The optimum number of stations in the catchments for an admissible 10% error in the estimation of the mean rainfall will be
A
3
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B
6
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C
9
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D
12
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Solution
The correct option is C 9 The number of optimum stations can be given as N=(Cvε)2=(29.5410)2 =8.72≈9stations