Zachs Measure of Central Tendancy

Friday, October 31, 2008

  • the sum of all data in a set of data
  • divided by the number of numbers in the set of data
  • the average of a set of data

3,4,5,6,7,9.10,11 (3+4+5+6+7+9+10+11) /8= 6.875

the mean is 6.875


  • the middle number in a set of data


  • (4) is the median in this set of data


  • the most frequent occuring numbers in a set of data
  • if there are no most ocurring numbers there is no mode

6,6,6,6,6,6,6,6,6,6,6,6,6,9,13,13,15,19,22,22,22,22,22,23, in this set of

data (6) is the mode.

1,2,3,4,5,6 in this set of data there is no mode


  • the range is the highest value number subtracted from the lowest value number.
  • there is always a RANGE in a set of data.
  • second easiest

1,3,6,8, 9,10 1-10=9 the range is 9


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