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

6. 25% of the customers at XYZ Stores use a debit card to pay for their purchases. In a recent market research study, 18 of the Store’s over 20,000 customers on record was randomly selected for two 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 customers selected 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?

Expert Solution

milcah answered 1 year ago

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