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If $65\%$ of the population has black eyes, $25\%$ have brown eyes and the remaining have blue eyes, what is the probability that a person selected at random has :
(a) blue eyes?
(b) brown or black eyes?
(a) blue eyes?
(b) brown or black eyes?
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Population having blue eyes = $$\begin{aligned}& (100 - 65 - 25)\% = 10\% \\ & (a) \text{ P(blue eyes)} = 10\% \text{ or } \frac{1}{10} \\ & (b) \text{ P(brown or black eyes)} = 90\% \text{ or } \frac{9}{10}\end{aligned}$$