26. A tutor collected data about the number of absences her students had: 3 7 8 9 Determine the mean, standard deviation and variance for this data by hand showing all of your work. Keep 2 d.p. when necessary. { 5 marks - I } 27. The scores on a test worth 40 marks are shown: 17, 20, 21, 23, 23, 24, 25, 26, 29, 30, 30, 31, 31, 33, 34, 34, 36, 37, 39, 40 Show your work for full marks or name technology source used. a) If a student scores at the 80" percentile, what is the student's raw score? { 1 mark } b) In which percentile are the students who scored 30 out of 407 { 1 mark }