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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 that 40% of all customers pay in cash. During a one-hour period, 15 customers buy gasoline at this station.

(a) What is the probability that more than 8 and less than 12 customers pay in cash?

User BlueBright
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1 Answer

3 votes

Answer:

0.09312

Explanation:

15C9×0.4⁹×0.6⁶ + 15C10×0.4¹⁰×0.6⁵ × 15C11×0.4¹¹×0.6⁴

0.09311963893

User Ali Nahid
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