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The counts of drivers involved in a head-on collision are categorized.

A complementary event denoted as $\stackrel{炉}{E}$ for any arbitrary event E is defined as the event of the non-occurrence of event E.

If E has a probability $P\left(E\right)$, then the complementary event has a probability as follows:

$P\left(\stackrel{炉}{E}\right)=1-P\left(E\right)$

The totals are computed for each row and column.

Define event Aas a randomly selected driver from 18102 uses seatbelt.

The complementary event of A is the non-occurrence of A.

Thus, is the event that the randomly selected driverdoes not use a seatbelt.

The number of drivers who use seatbelts is 10660.

The number of drivers in the study is 18102.

Thus, the probability of event A is computed as follows:

$$\begin{gathered} P\left(A\right)=\frac{10660}{18102} \\ =0.589 \end{gathered}$$

The probability of the complementary event is obtained as follows.

$$\begin{gathered} P\left(\stackrel{炉}{A}\right)=1-P\left(A\right) \\ =1-0.589 \\ =0.411 \end{gathered}$$

Thus, the complementary event has a probability of 0.411.