4-Felder-Tafel
| krank | gesund |
|
| positiv | 49/50000
| 999/50000
| 131/6250
|
| negativ | 1/50000
| 48951/50000
| 6119/6250
|
| 1/1000
| 999/1000 | 1 |
a) P(krank | positiv) = (49/50000) / (131/6250) = 49/1048 = 0.0468
b) P(krank | negativ) = (1/50000) / (6119/6250) = 1/48952 = 0.00002
