(Answered) In an italian breakfast cafe a waitress has observed that

Statistics

In an Italian breakfast cafe, a waitress has observed that 80% of her customers order coffee and 25% order both biscotti and coffee.

What is the probability that a randomly selected customer would not order a biscotti, given that he or she does not order coffee?

You need to know the percentage of her customers that order biscotti to answer the above question - let's assume that it is 40%.

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