![]() 7 + 9 equals 16, and 16 divided by 2 equals 8. These can be found easily once the values are arranged in order. In our example, you would take 7 and 9 - the two middle numbers - add them up and divide them by 2. A box plot is a diagram which summaries the key features of a data set using just 5 key values. What if the data set you're working with has an even amount of numbers? What if you had to find the median of 2, 4, 4, 7, 9, 10, 14, 15? You find the median here by taking the two middle numbers and finding their average.The third quartile (the 75th percentile) The maximum value. The first quartile (the 25th percentile) The median value. ![]() That's how we can be sure that it's our median. How to Compare Box Plots (With Examples) A box plot is a type of plot that displays the five number summary of a dataset, which includes: The minimum value. Construct a box-and-whisker plot for the above data set and describe the distribution. For the data set 1, 2, 3, 4, 5, the median number, 3, has 2 numbers before it and 2 numbers after it. The numbers of square feet (in 100s) of 10 of the largest museums in the world are shown below: 650, 547, 204, 213, 343, 288, 222, 250, 287, 269. The data represented in box and whisker plot format can be seen in Figure 1.
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