LASIK surgery complications. According to studies, 1%
of all patients who undergo laser surgery (i.e., LASIK) to correct their vision have serious post-laser vision problems (All About Vision, 2014). In a random sample of 200,000 LASIK patients, let x be the number who experience serious post-laser vision problems.

a. Find E(x).

b. Find Var(x).

c. Find the z-score for x = 1,928.

d. Find the approximate probability that fewer than 1,928 patients in a sample of 200,000 will experience serious post-laser vision problems.