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The interquartile range (IQR) of this data set is approximately 14.13, with the first quartile (Q1) at 56.78 and the third quartile (Q3) at 70.90.

Would you like further details or have any other questions?

Here are some related questions you might consider:
1. What is the mean of this data set?
2. What is the standard deviation of the data set?
3. Can you determine the range of the data?
4. How many data points fall within the interquartile range?
5. How would outliers be identified using the IQR?

**Tip:** The IQR is useful for identifying outliers, as any value that is below Q1 - 1.5*IQR or above Q3 + 1.5*IQR is considered an outlier.

Learn how to calculate the interquartile range (IQR) for the median incomes of U.S. states using statistical concepts like quartiles and the IQR formula. This problem explains how to find Q1 and Q3 and use them to determine the IQR, suitable for students in Grades 9-12.

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