Homework Answers
a)as trail continues till we receive our first success and trail success is independent and fixed from trail to trail therefore it is a geometric distribution
b)
here as number of trails are fixed therefore it is a binomial distribution and not geometric distribution
c)
P(3 or more profitable recommendations)=P(X=3)+P(X=4)+P(X=5)
=5C3(0.6)3*(0.4)2+5C4(0.6)4*(0.4)1+5C5(0.6)5*(0.4)0=0.3456+0.2592+0.0778 =0.683
d)
expected number =np=200*0.6 =120
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