Average of first five odd multiples of 3 is

Answer: Option C

According to the question,
First five odd multiples of 3 is = 3, 9, 15, 21, 27
$$\begin{array}{rl}& \therefore \text{Average}=\frac{3+9+15+21+27}{5}\\ & =\frac{75}{5}\\ & =15\end{array}$$