What is probability that at least 70 patients not satisfied


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?

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Basic Statistics: What is probability that at least 70 patients not satisfied
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