The [...] is the only measure of central tendency where the sum of the deviations of each value from the mean is always zero.
Answer
arithmetic mean
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Subject 4. Measures of Center Tendency d ratio data sets (e.g., incomes, ages, rates of return) have an arithmetic mean. All data values are considered and included in the arithmetic mean computation. A data set has only one arithmetic mean. This indicates that the mean is unique. <span>The arithmetic mean is the only measure of central tendency where the sum of the deviations of each value from the mean is always zero. Deviation from the arithmetic mean is the distance between the mean and an observation in the data set.
The arithmetic mean has the following disadvantages:
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