Trevius Trevius 02-11-2014 Mathematics contestada Stem-and-Leaf Plots question: How many swimmers were younger then 30 Stem -- Leaf 0 1-- 1 2-- 3,9 3 -- 4 -- 7 5-- 5,7,7,9 6-- 5,5,6,6,7,8,9 7-- 0,1 Key: 7-- 1 means 71