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# A16-6 Stem&Leaf, Average

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