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Mean
The average value of a data set.
Median
The middle value of a data set when arranged in order.
Mode
The value that occurs most frequently in a data set.
Data set
A collection of numbers or values.
Mean = Average
The mean and average are two terms for the same property of a data set.
Mean calculation
Add up all the numbers in the data set and divide by the total count.
Median calculation
Arrange the numbers in order and find the middle value. If there is an even number of values, take the mean of the two middle values.
Mode calculation
Identify the value that occurs most frequently in the data set.
Mean example
In a data set of 5 numbers (1, 8, 3, 2, 6), the mean is 4.
Median example
In a data set of 3 numbers (1, 2, 3), the median is 2.
Median example (even number of values)
In a data set of 4 numbers (1, 2, 3, 4), the median is 2.5.
Mode example
In a data set with repeated values (1, 2, 2, 3, 3, 3), the mode is 3.
Mean of ages
The mean age of a family with ages 222, divided by 6 members, is 37.
Mean of guitar sales
The mean number of guitars sold per month is 9.
Median of guitar sales
The median number of guitars sold per month is 9.5.
Mode of guitar sales
The mode of guitar sales is 10, as it occurs most frequently.
