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David's gasoline station offers 4 cents off per gallon if the customer pays in cash and...

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 40% of all customers pay in cash. During a one-hour period, 15 customers buy gasoline at this station. What is the probability that more than 8 and less than 12 customers pay in cash?

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Answer #1

Given X~Binomial(n=15,p=0.4)

P(X=x)=xC15*(0.4^x)*(0.6^(15-x))


SO the probability is

P(8

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