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Measures of Central Tendency

Mean: arithmetic average of all scores in a distribution
Example:
   _       Σx      
                                                         X = -------       Σx = sum of all scores                                                        N          N = number of scores

13 + 14 + 15 + 16 + 17 = 75

Σx = 75                 N= 5
                  _         Σx         75
              X = ------- = -------   = 15
                          N           5

Median: the point at which exactly half of the scores in a distribution are below & half are above
1. Odd number          13, 15, 16, 17, 19
 2. Even number       12, 13, 15, 17, 18, 19 = 16

Mode: most frequently occurring score(s)
X
f
16
15
13
12
11
10
9
8
1
1
2
5
4
4
1
2

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