| The Association of Chief Psychologists with Ontario School Boards |
|---|
| z-Score (X-M)/s | T-Score (10z + 50) | Wechsler IQ (15z + 100) | Stanford-Binet IQ (16z + 100) | Scaled Score (3z + 10) | Percentile Rank |
|---|---|---|---|---|---|
| 3.00 | 80 | 145 | 148 | 19 | 99.9 |
| 2.95 | 79.5 | 144 | 147 | -- | 99.8 |
| 2.90 | 79 | 144 | 146 | -- | 99.8 |
| 2.85 | 78.5 | 143 | 146 | -- | 99.8 |
| 2.80 | 78 | 142 | 145 | -- | 99.7 |
| 2.75 | 77.5 | 141 | 144 | -- | 99.7 |
| 2.70 | 77 | 141 | 143 | -- | 99.6 |
| 2.65 | 76.5 | 140 | 142 | 18 | 99.6 |
| 2.60 | 76 | 139 | 142 | -- | 99.5 |
| 2.55 | 75.5 | 138 | 141 | -- | 99.5 |
| 2.50 | 75 | 138 | 140 | -- | 99.4 |
| 2.45 | 74.5 | 137 | 139 | -- | 99.3 |
| 2.40 | 74 | 136 | 138 | -- | 99.2 |
| 2.35 | 73.5 | 135 | 138 | 17 | 99.1 |
| 2.30 | 73 | 135 | 137 | -- | 98.9 |
| 2.25 | 72.5 | 134 | 136 | -- | 98.8 |
| 2.20 | 72 | 133 | 135 | -- | 98.6 |
| 2.15 | 71.5 | 132 | 134 | -- | 98.4 |
| 2.10 | 71 | 132 | 134 | -- | 98.2 |
| 2.05 | 70.5 | 131 | 133 | -- | 98.0 |
| 2.00 | 70 | 130 | 132 | 16 | 97.7 |
| 1.95 | 69.5 | 129 | 131 | -- | 97.4 |
| 1.90 | 69 | 129 | 130 | -- | 97.1 |
| 1.85 | 68.5 | 128 | 130 | -- | 96.8 |
| z-Score (X-M)/s | T-Score (10z + 50) | Wechsler IQ (15z + 100) | Stanford-Binet IQ (16z + 100) | Scaled Score (3z + 10) | Percentile Rank |
| 1.80 | 68 | 127 | 129 | -- | 96.4 |
| 1.75 | 67.5 | 126 | 128 | -- | 96.0 |
| 1.70 | 67 | 126 | 127 | -- | 95.5 |
| 1.65 | 66.5 | 125 | 126 | 15 | 95.0 |
| 1.60 | 66 | 124 | 126 | -- | 94.5 |
| 1.55 | 65.5 | 123 | 125 | -- | 93.9 |
| 1.50 | 65 | 123 | 124 | -- | 93.3 |
| 1.45 | 64.5 | 122 | 123 | -- | 92.6 |
| 1.40 | 64 | 121 | 122 | -- | 91.9 |
| 1.35 | 63.5 | 120 | 122 | 14 | 91.2 |
| 1.30 | 63 | 120 | 121 | -- | 90.3 |
| 1.25 | 62.5 | 119 | 120 | -- | 89.4 |
| 1.20 | 62 | 118 | 119 | -- | 88.5 |
| 1.15 | 61.5 | 117 | 118 | -- | 87.5 |
| 1.10 | 61 | 117 | 118 | -- | 86.4 |
| 1.05 | 60.5 | 116 | 117 | -- | 85.3 |
| 1.00 | 60 | 115 | 116 | 13 | 84.1 |
| 0.95 | 59.5 | 114 | 115 | -- | 82.9 |
| 0.90 | 59 | 114 | 114 | -- | 81.6 |
| 0.85 | 58.5 | 113 | 114 | -- | 80.2 |
| 0.80 | 58 | 112 | 113 | -- | 78.8 |
| 0.75 | 57.5 | 111 | 112 | -- | 77.3 |
| 0.70 | 57 | 111 | 112 | -- | 75.8 |
| 0.65 | 56.5 | 110 | 110 | 12 | 74.2 |
| z-Score (X-M)/s | T-Score (10z + 50) | Wechsler IQ (15z + 100) | Stanford-Binet IQ (16z + 100) | Scaled Score (3z + 10) | Percentile Rank |
| 0.60 | 56 | 109 | 110 | -- | 72.6 |
| 0.55 | 55.5 | 108 | 109 | -- | 70.9 |
| 0.50 | 55 | 108 | 108 | -- | 69.2 |
| 0.45 | 54.5 | 107 | 107 | -- | 67.4 |
| 0.40 | 54 | 106 | 106 | -- | 65.5 |
| 0.35 | 53.5 | 105 | 106 | 11 | 63.7 |
| 0.30 | 53 | 104 | 105 | -- | 61.8 |
| 0.25 | 52.5 | 104 | 104 | -- | 59.9 |
| 0.20 | 52 | 103 | 103 | -- | 57.9 |
| 0.15 | 51.5 | 102 | 102 | -- | 56.0 |
| 0.10 | 51 | 102 | 102 | -- | 54.0 |
| 0.05 | 50.5 | 101 | 101 | -- | 52.0 |
| 0.00 | 50 | 100 | 100 | 10 | 50.0 |
| -0.05 | 49.5 | 99 | 99 | -- | 48.0 |
| -0.10 | 49 | 98 | 98 | -- | 46.0 |
| -0.15 | 48.5 | 98 | 98 | -- | 44.0 |
| -0.20 | 48 | 97 | 97 | -- | 42.1 |
| -0.25 | 47.5 | 96 | 96 | -- | 40.1 |
| -0.30 | 47 | 96 | 95 | -- | 38.2 |
| -0.35 | 46.5 | 95 | 94 | 9 | 36.3 |
| -0.40 | 46 | 94 | 94 | -- | 34.5 |
| -0.45 | 45.5 | 93 | 93 | -- | 32.6 |
| -0.50 | 45 | 93 | 92 | -- | 30.8 |
| -0.55 | 44.5 | 92 | 91 | -- | 29.1 |
| z-Score (X-M)/s | T-Score (10z + 50) | Wechsler IQ (15z + 100) | Stanford-Binet IQ (16z + 100) | Scaled Score (3z + 10) | Percentile Rank |
| -0.60 | 44 | 91 | 90 | -- | 27.4 |
| -0.65 | 43.5 | 90 | 90 | 8 | 25.8 |
| -0.70 | 43 | 90 | 89 | -- | 24.2 |
| -0.75 | 42.5 | 89 | 88 | -- | 22.7 |
| -0.80 | 42 | 88 | 87 | -- | 21.2 |
| -0.85 | 41.5 | 87 | 86 | -- | 19.8 |
| -0.90 | 41 | 87 | 86 | -- | 18.4 |
| -0.95 | 40.5 | 86 | 85 | -- | 17.1 |
| -1.00 | 40 | 85 | 84 | 7 | 15.9 |
| -1.05 | 39.5 | 84 | 83 | -- | 14.7 |
| -1.10 | 39 | 84 | 82 | -- | 13.6 |
| -1.15 | 38.5 | 83 | 82 | -- | 12.5 |
| -1.20 | 38 | 82 | 81 | -- | 11.5 |
| -1.25 | 37.5 | 81 | 80 | -- | 10.6 |
| -1.30 | 37 | 81 | 79 | -- | 9.7 |
| -1.35 | 36.5 | 80 | 78 | 6 | 8.8 |
| -1.40 | 36 | 79 | 78 | -- | 8.1 |
| -1.45 | 35.5 | 78 | 77 | -- | 7.4 |
| -1.50 | 35 | 78 | 76 | -- | 6.7 |
| -1.55 | 34.5 | 77 | 75 | -- | 6.1 |
| -1.60 | 34 | 76 | 74 | -- | 5.5 |
| -1.65 | 33.5 | 75 | 74 | 5 | 5.0 |
| -1.70 | 33 | 75 | 73 | -- | 4.5 |
| -1.75 | 32.5 | 74 | 72 | -- | 4.0 |
| z-Score (X-M)/s | T-Score (10z + 50) | Wechsler IQ (15z + 100) | Stanford-Binet IQ (16z + 100) | Scaled Score (3z + 10) | Percentile Rank |
| -1.80 | 32 | 73 | 71 | -- | 3.6 |
| -1.85 | 31.5 | 72 | 70 | -- | 3.2 |
| -1.90 | 31 | 72 | 70 | -- | 2.9 |
| -1.95 | 30.5 | 71 | 69 | -- | 2.6 |
| -2.00 | 30 | 70 | 68 | 4 | 2.3 |
| -2.05 | 29.5 | 69 | 67 | -- | 2.0 |
| -2.10 | 29 | 69 | 66 | -- | 1.8 |
| -2.15 | 28.5 | 68 | 66 | -- | 1.6 |
| -2.20 | 28 | 67 | 65 | -- | 1.4 |
| -2.25 | 27.5 | 66 | 64 | -- | 1.2 |
| -2.30 | 27 | 66 | 63 | -- | 1.1 |
| -2.35 | 26.5 | 65 | 62 | 3 | 0.9 |
| -2.40 | 26 | 64 | 62 | -- | 0.8 |
| -2.45 | 25.5 | 63 | 61 | -- | 0.7 |
| -2.50 | 25 | 63 | 60 | -- | 0.6 |
| -2.55 | 24.5 | 62 | 59 | -- | 0.5 |
| -2.60 | 24 | 61 | 58 | -- | 0.5 |
| -2.65 | 23.5 | 60 | 58 | 2 | 0.4 |
| -2.70 | 23 | 60 | 57 | -- | 0.4 |
| -2.75 | 22.5 | 59 | 56 | -- | 0.3 |
| -2.80 | 22 | 58 | 55 | -- | 0.3 |
| -2.85 | 21.5 | 57 | 54 | -- | 0.2 |
| -2.90 | 21 | 57 | 54 | -- | 0.2 |
| -2.95 | 20.5 | 56 | 53 | -- | 0.2 |
| -3.00 | 20 | 55 | 52 | 1 | 0.1 |
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