Question

um voluntário do clube de corrida local contou o número de participantes em cada corrida.
participantes por corrida
caule folha
2 3 3
3 0 1
4 4 5
5
6 4 5 5 9
7 4 7
8 1
9 4 6
10 0
quantas corridas tiveram pelo menos 39 participantes?
corridas

Explanation:

Step1: Analyze each stem (Caule) and leaf (Folha) combination to get the number of participants.

• For stem 2: Leaves are 3,3 → Numbers: 23, 23 (both < 39)
• For stem 3: Leaves are 0,1 → Numbers: 30, 31 (both < 39)
• For stem 4: Leaves are 4,5 → Numbers: 44, 45 (both ≥ 39) → Count = 2
• For stem 5: No leaves → 0
• For stem 6: Leaves are 4,5,5,9 → Numbers: 64, 65, 65, 69 (all ≥ 39) → Count = 4
• For stem 7: Leaves are 4,7 → Numbers: 74, 77 (both ≥ 39) → Count = 2
• For stem 8: Leaf is 1 → Number: 81 (≥ 39) → Count = 1
• For stem 9: Leaves are 4,6 → Numbers: 94, 96 (both ≥ 39) → Count = 2
• For stem 10: Leaf is 0 → Number: 100 (≥ 39) → Count = 1

Step2: Sum the counts from each stem.

Total = 2 (stem 4) + 4 (stem 6) + 2 (stem 7) + 1 (stem 8) + 2 (stem 9) + 1 (stem 10)
Calculate: 2 + 4 = 6; 6 + 2 = 8; 8 + 1 = 9; 9 + 2 = 11; 11 + 1 = 12

Answer:

12