“Mr. Mean”

 

Mnemonic Device:

  • “Mr. Mean”

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

  • draw a face:
  • ++
  • c
  • /

How It Works: (Mr. Mean never smiles and makes you work)

  • start with the eyes – add #’s
  • nose – count #’s (how many factors do you have?)
  • mouth – divide by that number

Example:

  • 20 + 30 + 40 = 90
  • 3 numbers (factors)
  • 90/3 = 30
  • 30 is the mean (average)

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