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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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`barX=A+(sumfd')/(sumf) xx C`
`= 45+(-108)/(216) xx 10`
=45 - 5 = 40
Arithmetic Mean = 40.
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