oam/knowledge base/mean, median and mode.md

Mean, median and mode

Term	Definition	How to find	Example
Mean	The average value of a set	Add up all values in the set to get the total sum of all values Count the number of values in the set Divide the total sum by the count	Given the {1, 5, 4, 7} set, its mean is (1+5+4+7)/4 = 17/4 = 4.25
Median	The value in a set which divides the set's upper half from the set's lower half	Arrange all values in the set from the lowest to the highest If the number of values is odd, the median is the value in the middle of the ordered set If the number of values is even, the median is the mean of the 2 values in the middle of the ordered set	Given the {1, 5, 4, 7} set, its median is {1,4,5,7} = (4+5)/2 = 4.5 Given the {1, 5, 4, 7, 11} set, its median is {1,4,5,7,11} = 5
Mode	The value(s) in a set that occurs the highest number of times	Count the amount of repetitions (frequency of appearance) of each value in the set The value (or values if more than one) that appear most is (are) the mode of the set	Given the {1, 1, 4, 5, 7, 7, 2, 2, 2} set, its mode is 2 Given the {2, 3, 4, 6, 3, 7, 2, 1} set, its mode is 2 or 3

Sources

• Mean, median, and mode review
• Mean, median, mode calculator