A) 0.25
B) 0.75
C) 0.50
D) 0.33
Correct Answer: A
Solution :
\[\frac{{{P}^{o}}-{{P}_{s}}}{{{P}^{o}}}=\frac{n}{n+N}\]; \[{{P}^{o}}=0.80,\,\,{{P}_{s}}=0.60\] \[\therefore \frac{n}{n+N}=\frac{0.2}{0.8}=0.25\].
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