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MEAN (Frequency Distribution Series)           Direct Method




                                                                            1.  Find mid values m= (l + l )/2
                                                                                                   1  2
                                                                            2.  Find fm
                                Wages         m=         f      fm
                                  (x)      (l  + l )/2                      3.  Find ∑ fm and ∑ f
                                             1
                                                 2
                                                                            4.  Apply formula
                                 0 – 100       50        2      100
                              100 – 200       150        1      150             ∑  fm
                                                                            X =    f
                              200 – 300       250        3      750             ∑
                              300 – 400       350        3     1050           2500
                                                                            =
                              400 – 500       450        1      450            10
                                                        ∑f =   ∑fm=         =
                                                       10     2500            250







                 Median
                 In statistics, the median is the middle value in a given list of numbers arranged in ascending or descending order.



                                      MEDIAN (Individual Series):




                                         Wages       Wages         1.  Arrange Data in Ascending Order
                                           (X)         (X)
                                                                   2.  Median =
                                           500         100
                                                               1               th
                                           200         200                  n1 +  item
                                                               2   Size of      2    
                                           100         300
                                                               3          th
                                           300         400         =  5 + 1
                                                                       2    item
                                           400         500
                                                      N = 5        = 3  item
                                                                       rd

                                                                   = 300


                 What if there are even number of items. Lets see!









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