Connect the top or the first quartile to the top of the third quartile, going through the second quartile. Make a box by drawing horizontal lines connecting the quartiles.Take the values of your first, second, and third quartiles and make a mark at those numbers on the plot line. Mark your first, second, and third quartiles on the plot line.Make sure to place the numbers at even intervals.
This should be long enough to contain all of your data, plus a little extra on either side. Now we need to find the median of the lower half of the data set in our example it would be the median of the two numbers to the left of 3. We've already found the second quartile of the data set, which is our median. (This is why we lined up all the numbers in Step 2.)
The median is the middle number in the data set when the data set is written from least to greatest. Take all your numbers and line them up in order, so that the smallest numbers are on the left and the largest numbers are on your right.
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