For the last question I did X-N(30, sqrt12squared)
(n-30)/sqrt12 = 1.29 (from z tables)
so n-30 = 4.47
so n = 34.47
so n =35
Gibbo, do you think I'll get the marks???
Edit ; I forgot the squared after the squareroot of 12!! (I did remember it in the exam)