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185         22
                   195          3

               14.The following table gives the marks of 80 students in a selection test


                    Marks            Number
                                   of students

                   Below 10             3
                   Below 20            12

                   Below 30            27
                   Below 40            57
                   Below 50            75

                   Below 60            80


               Find the median mark.
               15.If the median of the following frequency distribution is 46, find the missing frequencies:

                 Variable   Frequency
                 10 - 20      12
                 20 - 30      30

                 30 - 40       ?
                 40 - 50      65
                 50 - 60       ?

                 60 - 70      25
                 70 - 80      18

                  Total      229



















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