Find the probability customers pay their bill in full, Applied Statistics

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The proportion of American Express credit-card holders who pay their credit card bill in full each month is 23%; the other 77% make only a partial or no payment.

(a) In a random sample of 15 customers, what is the probability that:

i. 4 customers pay their bill in full?

ii. More than 6 customers pay their bill in full?

(b) In a random sample of 17 customers, what is the probability that:

i. 4 customers pay their bill in full?

ii. No more than 3 customers pay their bill in full?


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