Page 1 - Home Assignment-5 - Ch.14 Statistics (Measures of Central Tendency)
P. 1

SAI International Residential School
                                                           Class –IX


                Mathematics

               Chapter-14: Statistics


               Home Assignment-5


                Sub topics: Measures of Central Tendency (Mean, Median & Mode)

        1.    A school has two sections. The mean mark of one section of size 40 is 60 and mean
              mark of other section of size 60 is 80. Find the combined mean of all the students of
              the school.


        2.



























              Find the mean salary of 60 workers of a factory from the above table.

        3.    The mean of the following distribution is 107. Find the value of    and    .
                                                                                 1
                                                                                        2
              x   15      45      75         105          135     165           195              Total
              f     2        3       f1          10             3          f2             2                 30

        4.    The mean of 6 numbers is 20. If one number is deleted their mean is 15. Find the
              deleted number.

        5.    The mean of 200 items was 50. Later on ,it was discovered  that the two items were
              misread as 92 and 8 instead of 192 and 88. Find the correct mean.
   1   2