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FOR THE GROUPED DATA Ef (x - 1)2 N = N- 1 Efx2 (Efx)2 = N - 1 N ( N - 1)Number of Class

FOR THE GROUPED DATA Ef (x - 1)2 N = N- 1 Efx2 (Efx)2 = N - 1 N ( N - 1)Number of Class Correct Answers Frequency Mark fx X - LL f(x - ) f(x - 1)2 x2 fX2 0 - 2 2 3 - 5 4 6 -8 7 9 - 11 10 12 - 14 12 15 - 17 10 18 - 20 5 Total 50

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