Question

The coefficient of variation of the rainfall for six rain gauge stations in a catchment was found to be 29.54%. The optimum number of stations in the catchment for an admissible 10% error in the estimation of the mean rainfall will be

• A. 9

Answer 1

The correct option is A 9
$N={\left(\frac{C_v}{ϵ}\right)}^2={\left(\frac{29.54}{10}\right)}^2$

$=8.7\simeq 9\left(say\right)$