- is a descriptive measure that describes the location of the "center" of a data set.
Mean
- is the average of a data set. Mean from the data of a population is known as the population mean while mean from the data of a sample set is known as sample mean.
Example 1
Jorge's scores in six basketball games are:
21 pts., 34 pts., 24 pts., 29pts., 19pts., 20pts.
Solve for the mean of this data set.
Solution:
Median (Md)
- is the middle value of a set.
The following formula solves the median of an ungrouped data:
Example 2
The following are raw data. Solve for the median of the data set.
The data should be arranged either in ascending or descending order to be able to locate the median using the formula above. This is the arranged form in ascending order:
The values in bold and red are located in the middle part of the array.Since the total number of observations is even (N = 120), then:
Mode (Mo)
- is the most frequently appearing data in the data set.
Example 3
In the data set:
33 is the most frequently appearing data. Thus, 33 is the mode of the data set.
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