Tristan records the number of customers who visit the store each hour on a Saturday. His data representing the first seven hours are 15, 23, 12, 28, 20, 18, and 23. How many customers visited the store during the eighth hour if the median number of customers per hour did not change?

First, sort the seven hourly counts: 12, 15, 18, 20, 23, 23, 28. Their median is 20, the middle value. If the eighth-hour count is 20, the middle two values in the sorted set of eight are both 20, so the median remains 20. Therefore, the answer is 20 customers.

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