Calculate the weighted mean from the following data:
`{:("Marks",60,75,63,59,55),("Weight",2,1,5,5,3):}`

Calculate weighted mean of the following data: {:("Marks(X)",81,76,74,58,70,73),("Weight(W)",2,3,6,7,3,7):}

Calculate the weighted mean of the following data: {:("Items",96,102,104,124,148,164),("Weight",5,6,3,7,12,9):}

Calculate weighted index number for 2001 from the following data:

Calculate (a) unweighted and (b) weighted mean price from the following :

Calculate the mean deviation from the mean for the following data: 7,64,43,67,49,59,44,47,61,59

Calculate the mean deviation from the mean for the following data: 39,70,48,42,55,63,46,54,44

Calculate the mean deviation from the mean for the following data:57,64,43,67,49,59,44,47,61,59

Calculate the mean deviation from the mean for the following data:38,70,48,40,42,55,63,46,54,44