Five students visiting the student health center for a free dental examination during National Dental Hygiene Month were asked how many months had passed since their last visit to a dentist. Their responses were as follows. 7 18 12 20 28 Assuming that these five students can be considered a random sample of all students participating in the free checkup program, construct a 95% condence interval for the mean number of months elapsed since the last visit to a dentist for the population of students participating in the program. (Round your answers to three decimal places.) (6.121 x ,21.879 x )