Dit word gegee dat X normaal verdeel is met gemiddeld μ = 47.3  en variansie σ² = 36. / It is given that X is normally distributed with mean μ = 47.3 and variance σ² = 36.

Die waarde van  wat so is dat 70% van alle -waardes groter as dit is, is / The value of  that is such that 70% of all -values is larger than it, is