Mean Sum of all observationsNumber of observations. In each group each value x is greater than a lower value l i and less than an upper value u i. Formula For Finding The Mean Of The Grouped Data Data 9th Grade Math Arithmetic Mean Find Mean Median and Mode for grouped data. . To estimate the Median use. Discrete data can only take particular values usually whole numbers such as the number of children per family. If n is even then the median is given by the mean of n2 th observation and n21 th observation. If n is odd then use the formula. Type your data in either horizontal or verical format for seperator you can use - or or or space or tab for sample click random button OR X Frequency Class Frequency. Then you take each value in data set subtract the mean and square the difference. Find the number of observations in the given set of data. Estimated Median L n2 BG w. How to Find Median Class of Grouped Da