Histogram
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Once all of the data are displayed in the stem and leaf diagram it is simply a question of looking at the most frequentlyoccurring value.
it is a shorthand for representing numbers break them each into 2 parts the last digit is called the leaf and the rest is called the stem. Ex. the number 75 has a stem of 7 and a leaf of 5. then collect all the numbers with the numbers and place them in a row. Ex.129 has stem of 12 and a leaf of 9.
stem-and-leaf plots
Once all of the data are displayed in the stem and leaf diagram it is simply a question of looking at the most frequently occurring value. By having the data arranged in an ordered list will make it easier to determine both the mode and median value.
To find the modal group in a back-to-back stem-and-leaf diagram, you need to look for the group with the highest frequency on both sides of the diagram. This group represents the mode for the data set. The mode is the value that appears most frequently in the data. In a back-to-back stem-and-leaf diagram, the modal group will be the one with the highest frequency on both sides of the stem.