There are 300 students enrolled in Business Statistics Histo

There are 300 students enrolled in Business Statistics. Historically, exam scores are normally distributed with a standard deviation of 22.75. Your instructor randomly selected a sample of 50 examinations and finds a mean of 64.4. Determine a 90% confidence interval for the mean score for all students taking the course.

90% CI = ___ to ____

the required 90% CI for normal with 50 sample and sample mean is 64.4 sd 22.75, is (59.11, 69.69)