My Notes Ask Your Teach Customers at a gas station pay with a credit card (A), d

Question

My Notes Ask Your Teach Customers at a gas station pay with a credit card (A), debit card and RC) = 0.3. 8), or cash (C) Assume that successive customers make independent choices with A)-0.5·mB)-0.2, (a) Among the next 100 customers, what are the mean and varlance of the number who pay with a debit card? customers customers variance 16 Eyglsin your reasoning Because we are interested in whether or not a debit card was card used, we can use the binoenial distribution. Xn the number of customers who use a debit eecause we are interested in whether orntadebit cd was used, we can use the binomial ditribution. X - the number of customers at the gas station Because we are interested in whether or not a debit card was card used, we can use the binomial distribution. x-the probability that a customer used a dethit (b) Answer part (a) for the number among the 100 who don't pay with cash variance Need Help? Podttr

Explanation / Answer

b) n = 100

not paying cash = 0.5 + 0.2 = 0.7

Mean = n * p

Mean = 70

Variance = 70 * 0.3 = 21

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