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17 July, 22:34

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?

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  1. 18 July, 01:54
    0
    0.09312

    Step-by-step explanation:

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

    0.09311963893
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