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What is the probability that at least 10 pay cash

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Here is my problem: Davids gasoline station offers 4 cents off per gallon if a customer pays cash and does not use a credit card. Past evidence indicates that 40% of all customers pay in cash. During a one hour period 25 customers buy gasoline at this station. What is the probability that at least 10 pay cash

Reference no: EM13247015

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