Chapter 5 - Continuous Random Variables - Exercises 5.20 - 5.52 - Learning the Mechanics - Page 241: 5.26d

$p(-1.96\leq z\leq-.33)=.3457$

According to Table IV, page 773: $p(0\lt z\leq.33)=.1293$ $p(0\lt z\leq1.96)=.4750$ $p(-1.96\leq z\leq-.33)=p(-1.96\leq z\leq0)-p(-.33\leq z\leq0)=p(0\lt z\leq1.96)-p(0\lt z\leq.33)=.4750-.1293=.3457$