normal distribution and probability

Hi, reagrding this on a normal curve.....

Having a bit of trouble, i have an example for which i have worked out that that proabilty for x bieng bigger than 0.84 ( with a mean of 1.8 and a SD of 0.44) to be 0.9854

I take it this is right, but now it wants to know p(1.0<x<2.0), and im not sure how to approach this.

Any ideas????????

( also i posted something about confidence intervals in the advanced section and meant to post that in here, any help on that would be great aswell ).