a random sample of 36 students at a community college showed an average age of 25 years. assume the ages of all students at the college are normally distributed with a standard deviation of 1.8 years. the 98% confidence interval for the average age of all students at this college is . a. 24.385 to 25.615 b. 23.200 to 26.800 c. 24.301 to 25.699 d. 23.236 to 26.764
