Stamiard Scores and Parcenles for a Normal Dislbution (cumulative values from the left) Standard score % Standard score % - 3.0 0.13 0.1 53.93 2.5 0.62 0.5 69.15 - 2 2.28 0.9 81.59 1.5 6.68 I 34.13 -1 15.3?Ir 1.5 93.32 0.9 13.41 2 92.72 -0.5 30.85 2.5 99.38 0.1 46.02 3 99.8? 0 50.00 3.5 99.98