5. A school board commissions a study of the absentee rate of students at Springeld High School. For a random sample of 20 student records, the number of days absent in the previous year is recorded, yielding a mean of 4.0 and a standard deviation of 4. Assume the population distribution is normal. a. What are the best point estimators of the unknown population mean and standard deviation? b. Construct a 95% condence interval for the mean number of days absent for all Springeld High students during the previous year. c. Interpret this condence interval. d. Based on you condence interval, would 6 days of absence be a likely guess for the population mean? Why or Why not