Answer to table 1 : practising with z statistics
| Element value | Population mean | Population standard deviation | z statistic | Area under the curve to the right of the z statistic |
|---|---|---|---|---|
| 8.0 | 12.0 | 2.0 | −2.0 | 0.4772 + 0.5 = 0.9772 |
| 6.0 | 12.0 | 2.0 | −3.0 | 0.4987 + 0.5 = 0.9987 |
| 16.0 | 14.0 | 4.0 | 0.5 | 0.5 − 0.1915 = 0.3085 |
| 20.0 | 14.0 | 4.0 | 1.5 | 0.5 − 0.4332 = 0.0668 |