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