Find probability customers did not order pastry with drink

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Reference no: EM13148884

In a busy coffee shop, which is a member of an international chain of coffee shops, 40% of customers order a pastry in addition to their drink. If 20 customers were selected at random during one business day, what is the probability that at least 11 of them did not order a pastry with their drink.

Reference no: EM13148884

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