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15 cards from this deck
Mean, median, and mode
How spread out the data is
Add all values and divide by number of values
Mean=SumNumber of values\text{Mean} = \frac{\text{Sum}}{\text{Number of values}}Mean=Number of valuesSum
Sum=Mean×Number of values\text{Sum} = \text{Mean} \times \text{Number of values}Sum=Mean×Number of values
Middle value when arranged in order
Add them and divide by 2
Not affected by extreme values
Value that appears most often
Yes, if values appear equally often
All values appear same number of times
Range=Largest−Smallest\text{Range} = \text{Largest} - \text{Smallest}Range=Largest−Smallest
Put values in order from smallest to largest
Only when the question asks you to
Use Sum=Mean×Number\text{Sum} = \text{Mean} \times \text{Number}Sum=Mean×Number
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