Statistics are handy when it comes to making predictions, but to make accurate predictions, you need to know how reliable your results are. The following Z- table shows standard scores and percentiles in a standard distribution:

Standard Score Percentile Standard Score Percentile Standard Score Percentile
–3.4 0.03% –1.1 13.57% +1.2 88.49%
–3.3 0.05% –1.0 15.87% +1.3 90.32%
–3.2 0.07% –0.9 18.41% +1.4 91.92%
–3.1 0.10% –0.8 21.19% +1.5 93.32%
–3.0 0.13% –0.7 24.20% +1.6 94.52%
–2.9 0.19% –0.6 27.42% +1.7 95.54%
–2.8 0.26% –0.5 30.85% +1.8 96.41%
–2.7 0.35% –0.4 34.46% +1.9 97.13%
–2.6 0.47% –0.3 38.21% +2.0 97.73%
–2.5 0.62% –0.2 42.07% +2.1 98.21%
–2.4 0.82% –0.1 46.02% +2.2 98.61%
–2.3 1.07% 0.0 50.00% +2.3 98.93%
–2.2 1.39% +0.1 53.98% +2.4 99.18%
–2.1 1.79% +0.2 57.93% +2.5 99.38%
–2.0 2.27% +0.3 61.79% +2.6 99.53%
–1.9 2.87% +0.4 65.54% +2.7 99.65%
–1.8 3.59% +0.5 69.15% +2.8 99.74%
–1.7 4.46% +0.6 72.58% +2.9 99.81%
–1.6 5.48% +0.7 75.80% +3.0 99.87%
–1.5 6.68% +0.8 78.81% +3.1 99.90%
–1.4 8.08% +0.9 81.59% +3.2 99.93%
–1.3 9.68% +1.0 84.13% +3.3 99.95%
–1.2 11.51% +1.1 86.43% +3.4 99.97%