Final answer:
Approximately 68% of the teens killed in motor vehicle related crashes in the year 2000 were not wearing a safety belt.
Step-by-step explanation:
In the year 2000, approximately 68% of the teens killed in motor vehicle related crashes were not wearing a safety belt.
To calculate the percentage, we need to find the number of teens killed who were not wearing a safety belt and divide it by the total number of teens killed in motor vehicle related crashes.
For example, if there were 100 teens killed in total and 68 of them were not wearing a safety belt, the percentage would be 68/100 = 0.68 or 68%.
This statistic emphasizes the importance of wearing safety belts while driving to reduce the risk of injuries and fatalities in motor vehicle crashes.