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anygoal [31]
3 years ago
15

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

e 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?
Mathematics
1 answer:
elixir [45]3 years ago
5 0

Answer:

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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This is question of geometric sequence, equation of growth for this matter. The explicit formula for geometric sequence is given by:

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Substituting, beetles after 5 weeks will be;
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