Chapter 2
CALCULATING DESCRIPTIVE STATISTICS: MEASURES OF CENTRAL TENDENCY
Finding the center of the data
One of the most common roles served by descriptive statistics is determining the central tendency of data. This chapter investigates the primary means by which the “center” of a data set can be described, including the mean, median, mode, and percentiles.
Data may be reported in either raw or summarized form. To understand the central tendency of raw data, the mean, median, mode, and weighted mean can be very helpful. The position of raw data can be described using percentiles. Summarized data, in the form of frequency distributions, can be described using a weighted mean technique.

Mean

The average
 
2.1 The table below lists the number ...

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