terinarian collects data on the number of times race horses are raced during their careers. The veterinarian finds that the average number of races a horse enters is ?¯=15.3 , with a standard deviation of ?=6.8 in a sample of ?=20 horses. A 90% confidence for ? , the average number of times a horse races, is given by:   Group of answer choices a. (12.32, 18.28). b.(12.12, 18.48). c. (11.38,19.22)

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