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):}`

Calculate the AM of the following data using short-cut method .

Calculate mean and standard deviation of the following data by short-cut method:

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

Find out arithmetic mean from the following distribution by Short-cut Method: {:("Items",10-8,8-6,6-4,4-2,2-0),("Frequency"," "10," "8," "6," "4," "2):}

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

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