Page 1 - lesson notes 61 xi M.O.D
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SAI INTERNATIONAL SCHOOL


                                                   ECONOMICS



                                                        Class-XI


                                  [STATISTICS FOR ECONOMICS]


                                                   CHAPTER -10


                                      MEASURES OF DISPERSION


                                                       Module-61



               TOPIC


                   •  Standard deviation (S. D /  ))  Discrete  series


                       &Grouped series(all  methods)
                   •

               SHORT NOTES





                Standard Deviation
               Standard deviation is the square root of the arithmetic mean of the squares of
               deviations of the items from their mean values. It is often expressed by the lower

               case of Greek letter sigma    (Discrete series)
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