**Mnemonic Device:**

- Ms. Dee is so MEAN; she makes me ADD then DIVIDE.

**Explanation:** to remember how to calculate the average (mean).

- MEAN – ADD all the numbers then DIVIDE by the total number of items

**Example:**

- 4 + 8 + 12 = 24
- 3 numbers (factors)
- 24/3 = 8
- 8 is the average (mean)

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