Six Sigma and Beyond: Statistics and Probability, Volume III

  1. Mean: Average value f k calculated from all observations (center of gravity).

    Example - Found mean X to be 3.15 people

  2. Mode: Most frequently observed value of X k , highest f k .

    Example - Maximum f k = 8 cars occurs when X k = 2 people

  3. Median: Value of ordered X k that divides data in half.

    Example - Half (n/2 = 10) data points lie below, half above 3

  4. Mid-Range: Value halfway between minimum and maximum observed values.

    1/2 (Maximum + Minimum) = 1/2 (6 + 2) = 4 people

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