SOLUTION: 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.

Question 128642: 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 twenty-five customers buy gasoline at this station.
(4) What is the probability that at least ten pay in cash?
A) 0.416
B) 0.575
C) 0.586
D) 0.425

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
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 twenty-five customers buy gasoline at this station.
(4) What is the probability that at least ten pay in cash?
A) 0.416
B) 0.575
C) 0.586
D) 0.425
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That is a binomial problem with n=25,p=0.4,10<=x<=25
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I used the binomcdf function on a TI calculator to get:
1-binomcdf(25,0.4,9) = 0.5754...
Cheers,
Stan H.
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