Question

eric, an arborist, recorded the heights of all the trees in a local park. tree heights (cm) stem leaf 85 1 7 86 87 1 4 6 8 88 1 5 9 89 4 6 90 8 91 5 92 4 6 how many trees are at least 853 centimeters tall?

Explanation:

Step1: Understand stem - leaf plot

In a stem - leaf plot, the stem represents the tens digit and the leaf represents the units digit. For example, for a stem of 85 and leaf of 1, the value is 851.

Step2: Count trees ≥ 853

For the stem 85, the values are 851 and 857. Only 857 is at least 853. For stems 86 - 92, all the values are greater than 853.

• For stem 85: 1 value (857)
• For stem 87: 4 values (871, 874, 876, 878)
• For stem 88: 3 values (881, 885, 889)
• For stem 89: 2 values (894, 896)
• For stem 90: 1 value (908)
• For stem 91: 1 value (915)
• For stem 92: 2 values (924, 926)
• Total = 1+4 + 3+2+1+1+2=14

Answer:

14