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CBSE - IX
Measures of Central Tendency
The mean of a given set of values is equal to the sum of all the values divided by the total number of values.
The median is that value of the given number of observations, which divides it into exactly two parts.The value that lies in the very centre of a given set of values arranged in ascending or descending order, is called the median of the given data.
If the number of given values is odd, Median = [ (n+1)/2]th value, where n = number of given values.
If the number of given values is even, Median = Mean of (n/2)th and (n/2 + 1)th values, where n = number of given values.
The value that occurs the most number of times in a given set of values is called the mode of the given data or an observation with maximum frequency is known as mode.
Mean, Median and Mode together are called the measures of central tendencies of data.
The central tendencies of data depend on distribution of values and must be considered with other information for effective interpretation of data.
