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# A16-6 Stem&Leaf, Average

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### A16-6 Stem&Leaf, Average

1. 1. Stem-and-Leaf Plots Algebra 1 6.6 p.368
2. 2. Stem-and-Leaf Plot <ul><li>Arrangement of digits used to display and order data. </li></ul>
3. 3. Stem-and-Leaf Plot <ul><li>All the “stems” are the first digits of the numbers. </li></ul>
4. 4. Stem-and-Leaf Plot <ul><li>All the “stems” are the first digits of the numbers. </li></ul><ul><li>All the “leaves” are the second digits. </li></ul>
5. 5. Stem-and-Leaf Plot <ul><li>All the “stems” are the first digits of the numbers. </li></ul><ul><li>All the “leaves” are the second digits. </li></ul><ul><ul><li>These are listed with the other leaves of the same stem. </li></ul></ul>
6. 6. Stem-and-Leaf Example (unordered)
7. 7. Stem-and-Leaf Example (ordered)
8. 8. Mean, Median, and Mode Algebra 1 6.6 p. 369
9. 9. Mean <ul><li>Also called average. </li></ul>
10. 10. Mean <ul><li>Add all the numbers together, then divide by how many numbers you have. </li></ul>
11. 11. Median <ul><li>The middle number of all the numbers when the set is written in order. </li></ul>
12. 12. Median <ul><li>The middle number of all the numbers when the set is written in order. </li></ul><ul><li>If there are two middle numbers, average those numbers. </li></ul>
13. 13. Mode <ul><li>The numbers that occur most frequently. </li></ul>
14. 14. Mode <ul><li>The numbers that occur most frequently. </li></ul><ul><li>A set can have no mode or more than one mode. </li></ul>
15. 16. Mean, Median, and Mode <ul><li>Sometimes the mean is more representative of the data. </li></ul><ul><li>Other times, especially if the data is very different, the median or mode is a better choice. </li></ul>