Please give me the satisfaction score and what assumption needs to be made for this analysis

Question Help A physician with a practice is currently serving 290 patients. The physician would like to administer a survey to his patients to measure their satisfaction level with his practice. A random sample of 24 patients had an average satisfaction score of 8.2 on a scale of 1-10. The sample standard deviation was 1.2. Complete parts a and b below. a. Construct a 99% confidence interval to estimate the average satisfaction score for the physician's practice. The 99% confidence interval to estimate the average satisfaction score is (]]). (Round to two decimal places as needed.)