Let X= the number of customers pay by ecocash:X∼Bin(n,p).
Given n=10,p=0.7,q=1−p=0.3.
1.
P(X=3)=(310)(0.7)3(0.3)10−3=0.009001692
2.
P(X>6)=1−P(X=7)−P(X=8)
−P(X=9)−P(X=10)
=1−(715)(0.7)7(0.3)10−7−(815)(0.7)8(0.3)10−8
−(915)(0.7)9(0.3)10−9(1015)(0.7)10(0.3)10−10
=0.6496107184
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