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David's gasoline station offers 4 cents off per gallon if the customer pays in cash and does not use a credit card. Past evidence indicates

David's gasoline station offers 4 cents off per gallon if the customer pays in cash and does not use a credit card. Past evidence indicates that 55% of all customers pay in cash. During a one-hour period twenty-six customers buy gasoline at this station.

What is the probability that at least thirteen pay in cash?

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