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Mean
                 Mean is an essential concept in statistics. The mean is the average or the most common value in a group of
                 numbers.



                                      MEAN                    Direct Method
                                      (Individual Series):




                                                               1.   Find ∑x by adding all the values
                                          Wages
                                            (x)                             ∑x = 1500

                                            100
                                                               2.   Find total number of items (N)
                                            200
                                            300                       N=5

                                            400
                                                               3.   Apply formula
                                            500

                                         ∑x = 1500                 ∑  x
                                                               X =     =  1500  =  300
                                                                    N      5






                                       MEAN (Discrete Series):                    Direct Method
                                       (Frequency Array)


                                          Wages       f       fx                1.  Find fx
                                           (X)

                                                                                2.  Find ∑fx and ∑f
                                           100        2      200
                                                                                3.  Apply formula
                                           200        1      200
                                                                                    ∑  fx
                                           300        3      900                 X =
                                                                                     ∑  f
                                           400        3     1200

                                           500        1      500                 =  3000
                                                                                   10
                                                   ∑f =    ∑fx=
                                                   10      3000                  =  300













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