Practice Assignment 4 and 5

P( Churn=Yes)= 1869/7043= 0.2654

P( Churn=Yes| SeniorCitizen=1)= 476/1142= 0.4168

P( Churn=Yes and SeniorCitizen=1)= 476/7043= 0.0676

P(A)= 3069/7043= 0.4396

P(B)= 4171/7043= 0.5922

P(A and B)= 2392/7043= 0.3401

P( PaymentMethod= Electronic Check| Contract= 2 years) = 168/1695= 0.0991

Mean= 64.762 Standard Deviation= 30.09

Lower Bound= 64.762- 60.18= 4.582 Upper Bound= 64.762+ 60.18= 124.942

Customers within Range= 7043/7043= 100%