3. The marks an statistics exam for a sample at 40 students are as follows: [10 Marks12+ 1+ 1+ 1+ 2+2+1] 63 7'4 42 65 51 54 36 56 68 5? 62 64 76 6? 7'9 61 81 7'? 59 38 84 68 71 94 71 86 69 75 9? 55 43 82 83 54 79 62 63 58 41 47 a. Construct a stem-and leaf plat ta display the data. b. Use the stem-and leaf piat ta determine the number of students who scored: b.1: 7'0 marks or mare. b2: Less than 50 marks a. What is the median marks? :1. What is the IQR? Haw do you interpret this number? e. Using above information, draw a boxplot and describe the shape of this distribution. f. Without any calculation what you can say about the average students' grades