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OCR: FRACTION ARITHMETIC STANDARD PERCENT MEAN ERROR 37.6 39.8 3.0 15 42.0 3.5 20 40. 3.3 48.6 41.0 35 44.0 4.0 40 43.2 1.0 46.0 4.8 50 51.0 8 55 60.7 4,3 60 66.8 3.3 65 84.8 2.6 70 84.9 4.0 75 80.9 80 88.6 3.6 83.0 77.7 68.4 100 (FIRST) 65.8 3.0 100 (SECOND 65.7 3.0 100 (THIRD 63.0 2.9 CONTROL 55.8