the table contains the total number of fatal motor vehicle traffic crashes in the United States for a period of 18 years.
| Year | Total number of crashes | Year | Total number of crashes |
| Year 1 | 36,254 | Year 11 | 38,444 |
| Year 2 | 37,241 | Year 12 | 39,252 |
| Year 3 | 37,494 | Year 13 | 38,648 |
| Year 4 | 37,324 | Year 14 | 37,435 |
| Year 5 | 37,107 | Year 15 | 34,172 |
| Year 6 | 37,140 | Year 16 | 30,862 |
| Year 7 | 37,526 | Year 17 | 30,296 |
| Year 8 | 37,862 | Year 18 | 29,757 |
| Year 9 | 38,491 | Total | 653,782 |
| Year 10 | 38,477 |
Answer the following questions.
- What is the frequency of deaths measured from Year 7 through Year 11?
- What percentage of deaths occurred after Year 13?
- What is the relative frequency of deaths that occurred in Year 7 or before?
- What is the percentage of deaths that occurred in Year 18?
- What is the cumulative relative frequency for Year 13? Explain what this number tells you about the data.
OpenStax Introductory Business Statistics 2e, 1.3 Levels of Measurement, exercise 10