An ordered “stem and leaf” diagram for the students’ times, with “stem” 0 to 5 on the left hand side (in a vertical list) then a vertical line, before the “leaves”. Leaf values: 9 and 9 next to stem 1, 1, 4, 4, 5, 7 and 9 next to stem 2, 0, 0, 3 next to stem 3, 1 next to stem 4. There are no “leaves” next to stem 0 or stem 5. There is also a key showing that 1 line 9 means 19.