How to calculate or determine the number of customers statistically?

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Isaack Mutitu

What you need is to sample and then apply the sample size formula to estimate the number of customers in the cafe.Thanks

Andrew Paul McKenzie Pegman

Calculate the sample size required to yield a certain power (usually 0.8) for the test, given a predetermined Type I error rate α (usually 0.05), using the cumulative distribution function or predetermined tables.

Jos Feys

Do you mean like determining the distribution based on observed customers during a period? Then maybe it is a Poisson distribution:

https://www.probabilitycourse.com/chapter11/11_1_2_basic_concepts_of_the_poisson_process.php