Ah ok, I well remove the pictures then :)
Mark R, according to your last equation the answer is 0.019, but when I take the 2.344 and look in my Z table, I get 2.344 = 0.4905. I then say 0,5 minus 0,4905 and I get the answer 0.0095. But since the deviation is on both sides of Z, I just multiply...