. Calculate (a) R, 23, (b) R, 12 and (c) R,1, for the following data: X, = 6.8 S, = 1.0 "12 3.12 2.13 X2 = 7.0 S, = 0.8 %3D X = 74 S, = 9 "23 = 0.65 %3D %3D = 0.6 i3 = 0.7 %3D %3D

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