Algebra-1

Question Analysis
This question evaluates the student's ability to calculate the Interquartile Range (IQR) from a given data set. The IQR is the difference between the third quartile (Q3) and the first quartile (Q1).

Key Concept Explanation
The Interquartile Range (IQR) is a measure of statistical dispersion, representing the range covered by the middle 50% of the data. It is calculated as IQR = Q3 - Q1.

Step-by-step Solution
1. First, sort the data set: 5, 7, 9, 11, 13, 15, 17, 19, 21 (already sorted).
2. Determine the median (Q2): The median is 13.
3. Find Q1 (median of the firs...