[tex]\begin{gathered} \mu\text{ = 80} \\ r\text{ = 10} \\ x\text{ = 90} \\ z\text{ = }\frac{x\text{ - }\mu}{r} \\ z\text{ = }\frac{90\text{ - 80}}{10} \\ z\text{ = 1.0} \end{gathered}[/tex][tex]\begin{gathered} Pr(x>90)=>\text{ Pr(z >1.0)} \\ \end{gathered}[/tex][tex]\begin{gathered} Pr(z>1.0)\text{ = Pr(z>0) - Pr(0
