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Three measures of central tendency are the mode, the median and the mean.  The mean can only be used with interval/ratio level data. Measures of variability are numbers that describe how much variation or diversity there is in a distribution.

The comparison between the measures of central tendency and measures of variability is given below:

The measure of a central tendency refers to the central value for a probability distribution. The three common measures of central tendency that are used include:

  • Mean: Mean is the sum of all the numbers divided by the total numbers of the values.
  • Median: Median refers to the number in the middle in an ordered list.
  • Mode: Mode refers to the number that occurs most.

The measure of variability in statistics include the following:

  • Range: This is the difference between the highest number and the lowest number.
  • Standard deviation: This is the average distance from the mean.
  • Interquartile range: This is the range of the middle half of the distribution.
  • Variance: This is the average of the squared distance from the mean.

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