Question

Find the probabilities P(1.5<Z<2) and P(-2.5>Z<-0.5)

Answer 1

You will find this easier to use than the tables in your text

http://davidmlane.com/normal.html

your second question of P(-2.5>Z<-0.5) makes no sense,
you probably meant P(-2.5<Z<-0.5)

use the same link