If you are a male, with 95% certainty,
Your Maximum Natural Height in cm (inches) = (F + M + FF + FM + MF + MM) / 6 * 1.08 + 8.8 cm (3.5 inches)
If you are a male, with 99% certainty,
Your Maximum Natural Height in cm (inches) = (F + M + FF + FM + MF + MM) / 6 * 1.08 + 14 cm (5.5 inches)
What does "certainty" mean in this context?