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  3. 6. 25% of the customers at xyz stores use a debit

6. 25% of the customers at XYZ Stores use a debit card to pay for their...

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Basic Math

6. 25% of the customers at XYZ Stores use a debit card to payfor their purchases. In a recent market research study, 18 of theStore’s over 20,000 customers on record was randomly selected fortwo focus groups on new payment technologies. (5 points)

a.Istheselectionof18customersabinomialexperiment?Pleaseexplain.
b.Whatistheprobabilitythat5ofthe18customersselecteduseadebit
card to pay for their purchases?
c. What is the probability that at least 4 of the 18 customersselected use a
debit card to pay for their purchases?
d.Whatistheprobabilitythatatmost4ofthe18customersselectedusea
debit card to pay for their purchases?
e.Whatistheprobabilitythatatleast3butnomorethan6customers
selected use a debit card to pay for their purchases?

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