Measures of Central Tendency

There are 3 main things in Measures of Central Tendency:

1. Mean
2. Median
3. Mode

Mean

It is a sum of all the data values divided by the total number of data.

Formula:

Median

It is the middle value when the data are arranged in ascending order.

Mode

It is the value that occurs most often in a set of data.

Example 1:

Show the mean,median and mode in the set of data shown:

                           

                          {2,5,4,6,8,3,7,3,1}

Mean = 2+5+4+6+8+3+7+3+1 / 9

          = 4.3

Median= 1,2,3,3,4,5,6,7,8

            = 4 is the median.

Mode = 3

Example 2:

Show the mean,median and mode in the set of data shown:

                           

                          {32,35,34,36,31,33}

Mean = 32+35+34+36+31+33 / 6

          = 33.5

Median= 31,32,33,34,35,36

            = 33+34 / 2

            = 33.5

Mode = There is no mode.

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