Question

what is the mean of first five composite numbers?

Answer 1

$$\begin{gathered} \mathrm{The}\mathrm{first}5\mathrm{composite}\mathrm{numbers}\mathrm{are}: \\ 4,6,8,9\mathrm{and}10 \\ \mathrm{Now},\mathrm{mean}=\frac{\mathrm{sum}\mathrm{of}\mathrm{observations}}{\mathrm{number}\mathrm{of}\mathrm{observations}}=\frac{4+6+8+9+10}{5}=\frac{37}{5}=7.4 \end{gathered}$$