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The arithmetic mean is the most common measure of central tendency. It is simply the sum of the numbers divided by the number of numbers. The symbol Î¼ is used for the mean of a population. The symbol M is used for the mean of a sample. The formula for Î¼ is shown below: Î¼ = Î£X/N
1 CHAPTER 3: NUMERICAL DESCRIPTIVE MEASURES 1. Which of the following statistics is NOT a measure of central tendency? a) arithmetic mean b) median c) mode d) Q3 2. Which measure of central tendency can be used for both numerical and categorical variables? a) arithmetic mean b) median c) mode d) geometric mean 3.