1. To estimate the mean triglyceride levels of people in West Palm Beach, a blood test on 30 randomly selected people was conducted and yielded a mean triglyceride level of 220, with a standard deviation of 12. Construct a 95% confidence interval for the true average triglyceride level of people in West Palm Beach. Round your answer to three decimal places. (3 points) O a. (218.868, 229.132) Ob. (215.519, 224.481) Oc. (214.967, 233.033) Od. (219.741, 230.259)