A shoe store's records show that 30% of customers making a purchase use credit cards to make
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Question:
A shoe store's records show that 30% of customers making a purchase use credit cards
to make payment. This morning, 20 customer purchased shoes from the store.
a) What is the probability that at least 3 customers, but not more than 6, used credit
cards?
b) What is the expected number of customers who used credit cards?
c) Find the probability that exactly 14 customers did not use credit cards.
Expert Answer:
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