A) 6
B) 8
C) 12
D) 10
Correct Answer: C
Solution :
Probability of success \[p=\frac{1}{4}\] Probability of unsuccess \[q=\frac{3}{4}\] Mean = np Standard deviation = \[\sqrt{\text{Variance }}\] \[\Rightarrow \] Variance = 9 Þ \[npq=9\] Þ \[n.\,\frac{1}{4}.\,\frac{3}{4}=9\] Þ \[n=48\] Mean \[=np\] \[=\frac{1}{4}\times 48=12\].You need to login to perform this action.
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