Formula Of Quartile For Grouped Data. For discrete frequency distribution the formula for ith quartile is Qi iN 4th value i 1 2 3. The upper quartile value is the 7th data point Q3 9.
In order to see the relationship between Quartiles Deciles and Percentiles in case of Ungrouped data click here. The coefficient of quartile deviation is used to study and compare the degree of variation for two or more data set having different units of measurements. For grouped data class mode or modal class is the class with the highest frequency.
Jun 25 2010 In case of frequency distribution median can be calculated with the help of following formula.
For discrete frequency distribution the formula for ith quartile is Qi iN 4th value i 1 2 3. 3 rd quartile or the upper quartile separate the highest 25 of data from the lowest 75. Qi L in 4 - cf f c where i123. 2 nd quartile or middle quartile also same as median it divides numbers into 2 equal parts.
