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Mean and variance of the number of customers

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Reference no: EM132858000

Customers at a supermarket can pay with a credit card (A), debit card (B), or cash (C). Assume that successive customers make independent choices, with P(A)=0.5, P(B)=0.2,and P(C)=0.3.

(a) Among the next 100 customers, what are the mean and variance of the number of customers who pay with a debit card? [Hint: we only care about paying by debit card or NOT]

(b) Answer part (a) for the number among the 100 customers who don't pay with cash.

Reference no: EM132858000

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