Mean deviation for grouped data We know that data can be grouped into two ways : ( a ) Discrete frequency distribution , ( b ) Continuous frequency distribution .
Discrete frequency distribution :
Let the given data consist of n distinct values x1 , x2 , ..., xn occurring with frequencies f1 , f2 , ..., fn respectively . This data is called discrete frequency distribution Discrete frequency distribution : Mean deviation about mean
Numerical : Find mean deviation about the mean