Question

the stem and leaf plot below represents the amount of practice problems that julia has completed each day to study for an upcoming test. on how many days did julia complete 20 or less problems?
stem leaf
0 0, 3, 3, 7
1 2, 3, 5, 8, 9
2 4, 4, 6
3 4, 8
show your work here

Explanation:

Step1: Count days with stem 0

Stem 0 has leaves 0,3,3,7. So count is 4.

Step2: Count days with stem 1

Stem 1 has leaves 2,3,5,8,9. So count is 5.

Step3: Count days with stem 2 (≤20)

Stem 2 has leaves 4,4,6 (24,24,26 >20? Wait, stem is tens place. So stem 0: 0-9, stem 1:10-19, stem 2:20-29. Wait, the question is 20 or less. So stem 0 (0 - 9), stem 1 (10 - 19), and stem 2 with leaf 0? Wait no, stem 2 leaves are 4,4,6 which are 24,24,26 (all >20). So stem 2: 0 days. So total is 4 + 5 + 0? Wait no, wait stem 2: 20 is included? Wait stem is tens digit. So stem 0: 0-9, stem 1:10-19, stem 2:20-29. So 20 is stem 2, leaf 0. But in the plot, stem 2 has leaves 4,4,6 (so 24,24,26). So 20 or less: stem 0 (0-9), stem 1 (10-19), and stem 2 with leaf 0 (but there is no leaf 0 in stem 2). Wait, maybe I misread. Wait the problem says "20 or less". So numbers ≤20. So numbers from 0 to 20. So stem 0: 0-9 (all ≤20), stem 1:10-19 (all ≤20), stem 2:20 (but stem 2 leaves are 4,4,6 which are 24,24,26 >20). So stem 0: 4 days, stem 1:5 days, stem 2: 0 days (since 24,24,26 >20). Wait but wait, stem 2, leaf 0 would be 20, but there's no leaf 0. So total days: 4 (stem 0) + 5 (stem 1) = 9? Wait no, wait stem 2: 20 is 20, which is ≤20. But in the stem and leaf plot, stem 2 has leaves 4,4,6. So 20 is not present. So stem 0: 4, stem 1:5, stem 2: 0. Wait but wait, maybe I made a mistake. Wait the stem is the tens place. So stem 0: 0 - 9, stem 1:10 - 19, stem 2:20 - 29. So 20 is included in stem 2, leaf 0. But in the given plot, stem 2 has leaves 4,4,6 (so 24,24,26). So 20 is not in the data. So numbers ≤20: stem 0 (0-9), stem 1 (10-19). So 4 + 5 = 9? Wait but wait, let's check the leaves again. Stem 0: 0,3,3,7 (4 numbers: 0,3,3,7). Stem 1:2,3,5,8,9 (5 numbers:12,13,15,18,19). Stem 2:4,4,6 (24,24,26). So numbers ≤20: 0,3,3,7,12,13,15,18,19. That's 9 numbers. So total days: 4 + 5 = 9.

Answer:

9