Find out the arithmetic mean by the Step...

Find out the arithmetic mean by the Step-deviation Method of the following:
`{:("Class Interval",0-10,10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Frequency "," "12," "16," "32," "52," "42," "32," "18," "12):}`

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Find the mean deviation from the mean of the following data: Classes:,10-20,20-30,30-4040-50,50-60,60-70,70-80 frequency,2,3,8,14,8,3,2

Find out the arithmetic mean by the Step-deviation Method of the following: `{:("Class Interval",0-10,10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Frequency "," "12," "16," "32," "52," "42," "32," "18," "12):}`

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Find out the arithmetic mean by the Step-deviation Method of the following:
`{:("Class Interval",0-10,10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Frequency "," "12," "16," "32," "52," "42," "32," "18," "12):}`