Find out the margin of error

Question

1. Find out the critical value z_c necessary to form confidence interval at the level of confidence shown below

c-=0.96

z_c  = ?

(Round to two decimal places as required)

2. Find out the margin of error for the given values of c,s,and n

C = 0.90, s= 2.8 , n=36

E= ?

( Round to two decimal places as required)