a) 9
b) 10
c) 8
d) 11
Answer: a
Explanation: First five multiples of three are:
3, 6, 9, 12, 15.
$$\eqalign{
& {\text{Average}} = \frac{{ {3 + 6 + 9 + 12 + 15} }}{5} \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{45}}{5} \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 9 \cr} $$
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