1. The problem asks to find the third quartile (Q3) and the interquartile range (IQR) of a data set. 2. The third quartile Q3 is the value below which 75% of the data falls. 3. The interquartile range (IQR) is calculated as $$\text{IQR} = Q3 - Q1$$ where Q1 is the first quartile (25th percentile). 4. To find Q3, first arrange the data in ascending order, then find the value at the 75th percentile. 5. To find IQR, subtract Q1 from Q3. 6. Since no data set is provided, please provide the data to calculate Q3 and IQR.