5. A study involving stress is conducted among the students on a college campus. The stress scores follow a uniform distribution with the lowest stress score equal to one and the highest equal to five. Using a sample of 45 students, find: a. The probability that the mean stress score for the 45 students is less than seven. b. The 80th percentile for the mean stress score for the 45 students c. The probability that the total of the 55 stress scores is less than 170 d. The 85th percentile for the total stress score for the 45 students