a) 0.16
b) 0.40
c) 0.80
d) None of above
Answer: a
Explanation:
$$\eqalign{
& {\text{Required average,}} \cr
& = \frac{{ {\frac{1}{4} + \frac{1}{5} + \frac{1}{6} + \frac{1}{{10}} + \frac{1}{{12}}} }}{5} \cr
& = {\frac{{48}}{{60}} \times \frac{1}{5}} \cr
& = \frac{4}{{25}} \cr
& = 0.16 \cr} $$
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