Question

The mean of first six multiples of 5 is

(a) 3.5 (b) 18.5 (c) 17.5 (d) 30

Answer 1

The first six multiples of 5 are: 5, 10, 15, 20, 25, 30.
$$\begin{gathered} \mathrm{Mean}=\frac{\mathrm{Sum}\mathrm{of}\mathrm{observations}}{\mathrm{Number}\mathrm{of}\mathrm{observations}} \\ =\frac{5+10+15+20+25+30}{6} \\ =\frac{105}{6} \\ =17.5 \end{gathered}$$
Thus, the mean of first six multiples of 5 is 17.5.
Hence, the correct option is (c).