The number of customers who visited a coffee shop each hour on a Saturday morning were: 15, 22, 18, 30, 25, 18, 20. What is the median number of customers per hour?

✓ Correct Answer: Option B

To find the median, first arrange the numbers in ascending order: 15, 18, 18, 20, 22, 25, 30. The median is the middle value in an ordered data set. With seven values, the fourth value, 20, is the median.