Practice problem

Cumulative Frequency Table

+3 contributors

Contributors

Elise Molinaro
Sarah Walker
Alex Federspiel
Jonathan Heller

Random students were surveyed at the Ridgegrove middle school to see how long each student's pencil was. They constructed a frequency table using the following data:

Pencils of length 8" have a frequency of 15. Length 4.5" has 6. Length 7.5" has 10. Length 4" has 3. Length 6.75" has 11. Length 5.5" has 7. — Image Source: Clker-Free-Vector-Images via Pixabay (License)

If they started the range at $8"$ with an interval of $-1"$ , determine the cumulative frequency of $5"$ ?