Final answer:
The question falls under Health education and pertains to the risk assessment of fatal accidents among drivers under 18 compared to the average driver. Without exact statistics, it is widely recognized that young drivers have a higher risk of engaging in fatal accidents.
Step-by-step explanation:
The question about how many times more likely drivers under 18 are to have a fatal accident than the average driver deals with an understanding of traffic safety statistics and risk assessment, making it a subject matter most closely related to Health education.
Specifically, it approaches the topic from the standpoint of adolescent health risks and driver safety. Without specific statistical data provided for this exact question, it's challenging to provide an accurate number. However, the common understanding is that young drivers, especially teenagers, have a higher risk of fatal accidents due to inexperience and a greater likelihood of engaging in risky driving behaviors.