# Question

According to recent 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, 2006). In a random sample of 100,000 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 = 950.

d. Find the approximate probability that fewer than 950 patients in a sample of 100,000 will experience serious post-laser vision problems.

a. Find E (x).

b. Find Var(x).

c. Find the z -score for x = 950.

d. Find the approximate probability that fewer than 950 patients in a sample of 100,000 will experience serious post-laser vision problems.

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