Final answer:
The median of Q1, which is the middle value of the lower half of the data below Q2, is 2. The median of Q3, the middle value of the upper half of the data above Q2, is 9. These medians help determine the spread and distribution of a dataset.
Step-by-step explanation:
Quartiles are measures that divide a dataset into four equal parts. The second quartile (Q2), also known as the median, is the value that separates the data into two equal halves. For the given data where Q2 is 7, we look at the lower half to find the first quartile (Q1) and the upper half for the third quartile (Q3). The median of Q1 is the middle value of the data set that falls below Q2, while the median of Q3 is the middle value of the data set that is above Q2.
In this instance, the median of Q1 (the lower half) is 2, and the median of Q3 (the upper half) is 9. These values represent the middle points of their respective halves of the dataset, providing a clearer picture of the data's distribution.L