Answer :
Final answer:
The proportion of accidents involving alcohol when three vehicles are involved is determined by dividing the number of these specific accidents by the total number of accidents. The examples provided in the question contain mathematical errors in calculating the proportions.
Explanation:
Without the actual data in Table 4-1, it's impossible to provide the exact answer. However, let's conceptually understand how to approach this problem: If we want to determine the proportion of accidents involving alcohol when three vehicles were involved, we would need to divide the number of these specific accidents by the total number of accidents. For instance, if option b) 20/50 or 40% was accurate, this would imply that there were 20 three-vehicle accidents in which alcohol was a factor out of a total of 50 three-vehicle accidents. It's worth noting that the actual percentages given in the options are not calculated accurately. For example, 20/400 equals 5%, not 20%, and 20/30 equals 66.67%, not 30%.
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