4. There are 1000 patients at a hospital. Among the 1000 patients

4. There are 1000 patients at a hospital. Among the 1000 patients,
250 patients have Chills, and 300 patients have Fever. 100 patients have both chills and fever. Let C be the event that a randomly selected patient has Chills, and F be the event that a randomly selected patient has Fever. (Show all work. Just the answer, without supporting work, will receive no credit.)
(a) Provide a written description of the complement event of (C OR F).
(b) What is the probability of the complement event of (C OR F)?

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