Question

Calculate arithmetic mean using direct method.

$\begin{array}{cccccc}\text{Wages (in Rs)}& 10& 20& 30& 40& 50\\ \text{Number of workers}& 4& 5& 3& 2& 1\end{array}$

Answer 1

$\overline{X}=\frac{\sum fX}{N}=\frac{360}{15}=24$