8. The following data illustrates the number of calories in 20 different (all) main entrees at McDonalds. 770 520 590 290 680 420 740 650 240 370 790 600 520 420 410 830 170 250 600 500 Approximate to 4 decimal places when needed. a) Find the variance. [3 marks] b) Find the coefficient of variation. [2 marks] MDM4U Page 3 of 4 Name: c) Find the interpercentile range between P20 and P70. [3 marks] 9. The weighting of each assessment IS shown In the Assessment Weighting Student Student table, along with the marks of 2 students. Which I 2 student received the higher mark? Show your 72 work. [4 marks] 70 Tests 40 80 77 Exam 30 70 75