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 at least 70 patients will not be satisfied with the after-surgery care?
A) 89.44%
B) 39.44%
C) 10.56%
D) 78.88%
E) 84.49%

Question

Quizplus · Accepted Answer

= ρ = .2
P(p < 70/ 400) = P(p < .175) = P= P(z < −.025 / .02)
= P(z < −1.25) = .8944== .02

According to a Hospital Administrator, Historical Records Over the Past