Answer
Given p = 59% = 0.59 and n = 7
a. Mean = n x p
= 0.59 x 7 = 4.13
b. Variance = n x p (1-p)
= 7 x 0.59 (0.41) = 1.69
c. S.D = \sqrt Variance
=\sqrt 1.7 = 1.3
d. On average 4.1 out of 7 US voters think that most school textbooks put political correctness ahead of accuracy. samples would differ from mean by at most 1.3 (Standard deviation)
Work Step by Step
As given in answer