2.3: Measures of Central Tendencies

Weighted Mean

A weighted mean is the mean of a data set whose entries have varying weights.

Outlier

An outlier is a data entry that is far removed from the other entries in the data set.

Median

The median of a data set is the value that lies in the middle of the data when the data set is ordered. The median measures the center of an ordered data set by dividing it into two equal parts. If the data set has an odd number of entries, the median is the middle data entry. If the data set has an even number of entries, the median is the mean of the two middle data entries

Mode and Bimodal

The mode of a data set is the data entry that occurs with the greatest frequency. A data set can have one mode, more than one mode, or no mode. If no entry is repeated, the data set has no mode. If two entries occur with the same greatest frequency, each entry is a mode and the data set is called bimodal.

Mean

The mean of a data set is the sum of the data entries divided by the numbers of entries.