93 GWA 80-85 86-90 91-95 i=6 93 f 6 14 10 Σ f = 30 93 X 82.5 88 93 94 Fx 495 1,232 930 Σ fx = 2,657 94 2 cf 6 20 30 95 Lb 79.5 85.5 90.5
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