Lucy is a statistician who visits the café. She identifies a problem with Rachel's data collection strategy and offers a solution. Describe the problem and the solution Lucy may have suggested.

The question asks to identify a flaw in the data collection strategy and suggest an improvement. **Problem:** The primary issue is that the data was collected on a single, unspecified day. Business patterns in a café can vary significantly from day to day. For example, a Tuesday is likely to be very different from a Saturday. A single day could also be an anomaly for other reasons (e.g., bad weather, a local event). Therefore, data from just one day is unlikely to be representative of the overall business pattern. **Solution:** To make the findings more reliable and generalisable, data should be collected over a longer and more representative period. A good solution would be to sample customers at the same time slots but on several different days, including both weekdays and weekend days. This would allow Rachel and Mitch to see if the pattern they observed is typical and to make a more informed decision based on average waiting times across a whole week.