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Connecting the Dots…

One number for the whole lot

A batter's six scores: 20, 22, 24, 26, 28, 30. How is the batter playing? Give one number.

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Figure 1 — six readings. One try at a single number for all of them.

One good number is 25. Three scores are below it and three are above it.

A reading is one number you collected. One number can describe all the readings. It is a representative value.

Many numbers could describe them. Each one answers a different question.

In the lab, choose a number. Three scores should be above it and three below.

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This track

  1. 0 Start here
  2. 1 One number for the whole lot
  3. 2 Share it out equally
  4. 3 The middle one, once they are in order
  5. 4 When two numbers share the middle
  6. 5 The one that appears most
  7. 6 When one strange value pulls them apart
  8. 7 Which one answers the question
  9. 8 Dots on a number line
  10. 9 How far apart are the ends
  11. 10 Two bars for every item
  12. 11 Checkpoint
  13. 12 The big picture
  14. 13 Track quiz

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