Need to solve a. b. & c.

Question 5 (7 + 5 = 12 marks) Let z denote a variable that has a standard normal distribution. Neatly draw a diagram for each of the following, and determine the value of z* such that a. -z* and z* separate the middle 80% of all z values from the most extreme 20% (10% in each tail) (11/2) b. -z* and z* separate the middle 88% of all z values from the most extreme 12% (% in each tail) (1) c. -z* and z* separate the middle 96% of all z values from the most extreme 4% (% in each tail) (1)