Calculate the mean of the following data

Calculate the mean for the following data :

Calculate the mean for the following data

Calculate the mean for the following data {:("C.I.",30-34,35-39,40-44,45-49,50-54,),("F"," "2," "5," "6," "5," "2,):}

Calculate the mean for the following data.

Calculate the mean for the following data: {:(,"Wages per week upto Rs.",15,30,45,60,75,90,105,120),(,"No. of workers",12,30,65,107,157,202,222,230):}

The mean of the following data is

Find the mean of the following data

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

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):}