Formula
m14 = "Unknown" if m14 == "No" m15 = "Unknown" if m15 == "No" answers = [m1, m2, m3, m4, m5, m6, m7, m8, m9, m10, m11, m12, m13, m14, m15] numKnown(answers) * 100 / 15
m4
4,355
Gigajoules
m6
Unknown
Gigajoules
m9
Unknown
Gigajoules