The quartile and interquartile range calculations for the rainfall data are as follows:

• Lower quartile (Q1): 14.85 inches
• Upper quartile (Q3): 20.08 inches
• Interquartile range (IQR): 5.23 inches

This gives us insight into the spread of the middle 50% of the rainfall data.

Would you like to ask more questions or need further clarification?

Here are 5 related questions:

1. How can quartiles help in understanding data variability?
2. What other statistical measures can complement the interquartile range?
3. How does the interquartile range compare to the total range of the data?
4. How do extreme values (outliers) affect quartile calculations?
5. What are the limitations of using quartiles in small datasets?

Tip: The interquartile range is a good measure to understand the spread of data because it is not influenced by extreme outliers.