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Mathematics · 2025 · 3 marks
CBSE 2025 · Region 3 · Set 2 · Q27
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…
If $\displaystyle 65$% of the population has black eyes, $\displaystyle 25$% 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 ?
Marking-scheme solution
Population having blue eyes \(\displaystyle =(100-65-25) \%=10 \%\)
(a)
\(\displaystyle \mathrm{P}(\) blue eyes \(\displaystyle )=10 \%\) or \(\displaystyle \frac{1}{10}\)
(b)
\(\displaystyle P\left(\right.\) brown or black eyes) \(\displaystyle =90 \%\) or \(\displaystyle \frac{9}{10}\)
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CBSE Class 10 Mathematics past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.