When asked using the 95 confidence interval can we be

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Using the 99% confidence interval, can we be 99% confident that µ ≤ 19.5 days?
Week 4 4
If the population mean payment time is 19.5 days, what is the probability of observing a sample mean payment time of 65 invoices less than or equal to 18.1077 days?
References
Week 4 5 Black, K. (2017). Business statistics for contemporary decision making (9th ed.) . Hoboken, NJ: John Wiley & Sons, Inc.Bryman, Alan. 2012. Social Research Methods. New York: Oxford University Press.Hakim, Catherine. 1982. Secondary Analysis in Social Research: A Guide to Data Sources and Methods with Examples. London; Boston: Allen & Unwin.

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