Let X= the number of sales: X∼Bin(n,p)
a)
n=5,p=0.12,q=1−p=0.88
P(X=2)=(25)(0.12)2(0.88)5−2=0.098131968b)
n=5,p=0.12,q=1−p=0.88
P(X>4)=P(X=5)=(55)(0.12)5(0.88)5−5=0.0000248832c)
n=10,p=0.12,q=1−p=0.88
P(X>2)=1−P(X=0)−P(X=1)−P(X=2)=1−(010)(0.12)0(0.88)10−0−(110)(0.12)1(0.88)10−1−(210)(0.12)2(0.88)10−2=0.10868179372
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