how to find mean of grouped data
Mean of Grouped Data. The mean (or average) of observations, as we know, is the sum of the values of all the observations divided by the total number of observations. If x1, x2,. . ., xn are observations with respective frequencies f1, f2, . . ., fn, then this means observation x1 occurs f1 times, x2 occurs f2 times, and so on.