Answer
Given p = 63% = 0.63 and n = 5
a. Mean = n x p
= 5 x 0.63 = 3.15
b. Variance = n x p (1-p)
= 5 x 0.63 (0.37) = 1.2
c. S.D = \sqrt Variance
=\sqrt 1.2 = 1.1
d. On average 3.15 out of 5 adults cannot name a Supreme Court justice. The standard deviation is 1.1.
Work Step by Step
As given in answer