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

Question

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] · Answer 1 · 2022-07-18T09:38:52+03:00

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