26. A tutor collected data about the number of absences her students had: 1 3 3' 8 9 Determine the mean, standard deviation and variance for this data by hand showing all of your work. Keep 2 do when necessary. { 5 marks - l } 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 80Lh percentile, what is the student's raw score? { 1 mark } b) In which percentile are the students who scored 30 out of 40? { 1 mark } 28. Identify the type(s) of bias in these survey questions and reword them to remove the bias. { 3 marks 1} a) Do you think that small, yappy dogs make good pets? b) Destruction of the rain forest in Brazil occurs at a rate of about 14 000 km /year. Should logging be restricted in Canada? Type of Bias Reworded Question a) b)Inquiry { 14 marks } 25. i) The following data Summarize the attendance records for a class of mathematics students. {4 marks 1} Classes Missed Number of Students 0 l] 13 7 46 12 79 5 1012 3 131 5 2 a) Determine the approximate mean number of classes missed (to 2 decimal places) by students in this course by hand b) What is the median interval for the numbers of classes missed