Algebra-1

Step 1: Organize the data.  
The data is already sorted in increasing order:

11, 13, 15, 17, 19, 21, 23, 25, 26, 27, 29, 30, 32, 33, 34, 35, 37, 40, 41, 43

Step 2: Calculate the median (Q2).  
The median is the average of the 10th and 11th values since we have 20 data points. These values are:



The median (Q2) is:

Step 3: Find Q1 (the first quartile).  
Q1 is the median of the first half of the data (the first 10 values). The first 10 values are: 11, 13, 15, 17, 19, 21, 23, 25, 26, 27

The median of this subset is the 5th and 6th values, which are 19 and 21:

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