Answer
a. $-1.96$ and $1.96$
b. $-1.65$ and $1.65$
c. $-2.58$ and $2.58$
Work Step by Step
a. Half tail area is $0.05/2=0.025$ which corresponds to a z value of $-1.960$, the other z would be $1.960$
b. Half tail area is $0.1/2=0.05$ which corresponds to a z value of $-1.645$, the other z would be $1.645$
c. Half tail area is $0.01/2=0.005$ which corresponds to a z value of $-2.575$, the other z would be $2.575$
