Ans:
a)n=25 and p=0.1
P(2<=x<=4)=P(x=2)+P(x=3)+P(x=4)
=25C2*0.12*0.923+25C3*0.13*0.922+25C4*0.14*0.921
=0.2659+0.2265+0.1384
=0.6308
b)
n=100 and p=0.1
mean=np=100*0.1=10
standard deviation=sqrt(np(1-p))=sqrt(100*0.1*0.9)=3
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