113 Math
113.022 Statistics - Average, Mean, Mode, Dispersion, Range

Average, Mean, Mode

Average = Mean = Central Tendency
Median = Middle number
Mode = most common number

Interquartile range is the amount of spread in the middle 50% of a dataset
Interquartile (IQR) range =
- Find the median
- Find the median of the left half
- Find the median of the right half
- Subtract the smaller median from the larger medium
- That ^^ is the Interquartile range

Dispersion is the amount of spread in a dataset.

-10, 0, 10, 20, 30                  8, 9, 10, 11, 12
  • The dataset on the left is more disperse than the one on the right
  • They have the same average (10) but get there in very different ways

- Given a dataset, the range is simply
- order the numbers in the dataset ascending
- subtract the largest number from the smallest number
- Range can often tell you the difference in dispersion

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