FOR THE GROUPED DATA Ef (x - 1)2 N = N- 1 Efx2 (Efx)2 = N - 1 N ( N - 1)Weekly No. of
FOR THE GROUPED DATA Ef (x - 1)2 N = N- 1 Efx2 (Efx)2 = N - 1 N ( N - 1)Weekly No. of CLASS hours Laborers MARK FX X - LL (x - ()2 f(x - 1)2 X2 fX2 30 - 34 6 35 - 39 13 40 - 44 15 45 - 49 12 50 - 54 4 TOTAL
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