According to a hospital administrator, historical records over the past 10 years have shown that 20 percent of the major surgery patients are dissatisfied with after-surgery care in the hospital. A scientific poll based on 400 hospital patients was conducted. What is the probability that fewer than 64 patients will not be satisfied with the after-surgery care?
A) 47.72%
B) 2.28%
C) 97.72%
D) 95.44%
E) 4.56%

Question

Quizplus · Accepted Answer

= ρ = .2
P(p < 64/ 400) = P(p < .16) = P= P(z < −.04 / .02)
= P(z < −2) = .0228== .02

According to a Hospital Administrator, Historical Records Over the Past