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

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

Calculate weighted mean of the following data by using Direct and Short-cut Methods: {:("Items",81,76,74,58,70,73),("Weight",2,3,6,7,3,7):}

Find the mean of the following data 1,2,3,4,5,6,7,8,9 and 10

What is the standard deviation of the following data ? {:("Measurement",0-10,10-20,20-30,30-40),("Frequency",1,3,4,2):} (a) 81 (b) 7.6 (c) 9 (d) 2.26

What is the standard deviation of the following data ? {:("Measurement",0-10,10-20,20-30,30-40),("Frequency",1,3,4,2):} (a) 81 (b) 7.6 (c) 9 (d) 2.26

Find the quartile deviation of the following data: {:(x,f," "x,f),(2,4," "13,2),(3,6," "17,4),(5,8," "19,6),(7,9," "23,6),(11,10," ",):}