I’m having issues using the standard normal table backwards to look up the z value.  For example, “If a left tail area = 0.2 how does z= -0.84  ?” Step by step: Let’s draw what we left tail area = .2 means. Here is a … Continue reading I’m having issues using the standard normal table backwards to look up the z value. For example, “If a left tail area = 0.2 how does z= -0.84 ?”