Data were collected from a random sample of 35 economic development students during the Fall 2019 semester. Each student's Exam 1 grade was recorded. The mean exam score was 88 points with a standard deviation of 6.483 points. Apply the Empirical Rule to construct a 95% confidence interval for the mean Exam 1 grade in the population of all economic development students. Provide the lower end of your interval here only. Round your final answer to three decimal places