Of the children who die in car crashes, how many of them die due to an improper restraint system (or even just not being buckled in at all)? a. 1/4 b. 1/3 c. 1/2 d. 2/3
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According to a study conducted by the Harvard School of Public Health, a child seated in the front seat who was wearing a seatbelt was $31 \%$ more likely to be killed in an accident if the car had an air bag that deployed than if it did not. ${ }^{50}$ Let the sample space $S$ be the set of all accidents involving a child seated in the front seat wearing a seatbelt. Let $K$ be the event that the child was killed and let $D$ be the event that the airbag deployed. Fill in the missing terms and quantities: $P(\longrightarrow \mid \longrightarrow)=\longrightarrow P(\longrightarrow \mid \longrightarrow)$. HINT [When we say "A is $31 \%$ more likely than $\mathrm{B}$ " we mean that the probability of $\mathrm{A}$ is $1.31$ times the probability of B.]
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