According to a hospital administrator,historical records over the past 10 years have shown that 20% of the major surgery patients are dissatisfied with after-surgery care in the hospital.A scientific poll based on 400 hospital patients has just been 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

The probability that at least 70 out of 400 patients are dissatisfied can be calculated using the binomial distribution with n=400 and p=0.2. The probability of 70 or more dissatisfied patients is approximately 89.44%.

According to a Hospital Administrator,historical Records Over the Past 10