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

$p(-2.33\leq z\leq1.50)=.9233$

According to Table IV, page 773: $p(0\lt z\leq2.33)=.4901$ $p(0\lt z\leq1.50)=.4332$ $p(-2.33\leq z\leq1.50)=p(-2.33\leq z\leq0)+p(0\leq z\leq1.50)=p(0\leq z\leq2.33)+p(0\leq z\leq1.50)=.4901+.4332=.9233$