STATISTICS: MEASURES OF CENTRAL TENDENCY

FURTHER MATHEMATICS SSS1 FIRST TERM           

STATISTICS: MEASURES OF CENTRAL TENDENCY

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MEASUREMENT OF CENTRAL TENDENCY

• Mean, Median and Mode of ungrouped
• Mean, Median and Mode of grouped data

Measures of central tendency: This is a measure of how the data are centrally placed. The three commonest measures of position, depending on the information required are the arithmetic mean, median and mode.

MEAN: It is the most widely used measure and is sometimes called the arithmetical average. The mean of the number x₁, x₂, x₃, x₄ …………………x_n is given by:

   X = ∑x   where ∑x is the sum of all items.     n = number of items

           n  

When the data…