Mean, Median, Mode & Range

Mean, Median, Mode & Range:

(the measures of central tendencies.)


Mean:

- Mean means average. 
- To calculate it, you add together all of the numbers in your data set. Then divide that sum by the number of addends.

Example:

data_set = [5, 6, 8, 5]

Mean = (5 + 6 + 8 + 5) / 4 = 6


Median:

The middle number when listed in order from least to greatest.

First Example:


data_set = [5, 4, 9, 12, 7]

data_set_ordered = [4, 5, 7, 9, 12]

Median = 7

Second Example:

data_set = [5, 4, 9, 12, 7, 15]

data_set_ordered = [4, 5, 7, 9, 12, 15]

Median = (7 + 9 ) / 2 = 8


Mode:

The "mode" is the value that occurs most often. If no number in the list is repeated, then there is no mode for the list.

Example:

data_set = [5, 6, 8, 5]

Mode = 5


Range:


The range of a list of numbers is just the difference between the largest and smallest values.

Example:

data_set = [5, 4, 9, 12, 7, 15]


data_set_ordered = [4, 5, 7, 9, 12, 15]

Range = 15 - 4 = 11



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