The following is a contingency table showing the number of Covid positive and negative persons having the given vaccination status. No Vaccine 1st Dose 2nd Dose Total Covid Positive 15 20 Covid Negative 30 15 10 55 Total 45 35 100 a. What is the prohahili" ted person has taken the fir-t b. What is the probability that a randomly selected norson wrill hoCovid noativo sarith cor cof the vaccine's 2nd dose? c. What is the probability of a person with narination ctatis given that " .vegative? d. What is the probability of a person to be Covid positive given that he has NOT completed the 2nd dose? Answer in exact fraction, or rounded to at least 4 decimal places

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