The mean ¯x of the data is given by:
ΣFixi ⁄ΣFi
ΣFi ⁄Xi
ΣXi ⁄Fi
ΣFixi ⁄ΣX.F
The mean of the data is the sum of the values of all the observations divided by the total number of observations.
The mean ¯x of a discrete series of data is given by: