Find the Arithmetic Mean of the following data using Step Deviation Method : zz.PNG

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Step Deviation Method x¯ = A+ΣfdΣf×c , where d = (x-A)/c

Let Assumed mean A = 32
Class Interval c =45


Age Class
Interval		xMid xNo. of person fd=(x-A)/cf*d
15-1914.5-19.5174-3-12
20-2419.5-24.52220-2-40
25-2924.5 - 29.52738-1
30-3429.5-34.5322400
35-3934.5-39.53710110
40-4439.5-44.59218
   Σf= Σfd=



 x¯ = A+ΣfdΣf×c =