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### Graphing

posted Jun 16, 2010, 10:42 AM by Jon Hamlin

#### Mean, Mode, Median, Range

Mean, Median, Mode

Mean:

-- Also known as the average.  The mean is found by adding up all of the given data and
dividing by the number of data entries.

Example:
follows:

78
66
82                                  464 / 6 = 77.3
89
75                        Hence, 77.3 is the mean average of the class.
+ 74
464

Median:

-- The median is the middle number.  First you arrange the numbers in order from lowest
to highest, then you find the middle number by crossing off the numbers until you reach the
middle.

Example:
- use the above data to find the median:

66  74  75  78  82  89\

- as you can see we have two numbers, there is no middle number.  What do we do?
It is simple; we take the two middle numbers and find the average, ( or mean ).

75 + 78 = 153

153 / 2 = 76.5

Hence, the middle number is 76.5.

Mode:

-- this is the number that occurs most often.

Example:
- find the mode of the following data:

78  56  68  92  84  76  74  56  68  66  78  72  66
65  53  61  62  78  84  61  90  87  77  62  88  81

The mode is  78.