1. The problem statement, all variables and given/known data Find the Z value that corresponds to the given area. [PLAIN]http://img163.imageshack.us/img163/3785/problem1v.jpg [Broken] 3. The attempt at a solution What I did was go to Table E and find the closest number to 0.0166 which was 0.0160, and the Z numbers were 0.04 and 0.0. I then added them up together to get the answer of -0.04 (negative since it's less than 0) but it's wrong. The actual answer was: -2.13. I'm suspecting it's because the area is negative infinite to Z, and that's where I messed up at. Normally if it's between the median (which is 0) and Z, i would just add up both numbers. Therefore, how do I solve this problem if the area is between infinite to Z? 2. The problem statement, all variables and given/known data Find the z value to the left of the mean so that 98.87% of the area under the distribution curve lies to the right of it. I didn't understand the wording of this problem at all, but I did give my attempt at drawing the graph (not sure if it's correct). [PLAIN]http://img42.imageshack.us/img42/6641/problem2t.jpg [Broken] Actual Answer The answer of this problem is: -2.28 Please help!!!