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It is given that in a year, the number of passenger cars that rolled over in a crash is equal to 83,600.

The number of cars that did not rollover is equal to 5,127,400.

Theprobability of an event is the number of favorable outcomes of an event upon the total number of outcomes.

Mathematically,

$P\left(A\right)=\frac{\text{Number}\text{of}\text{favourable}\text{outcomes}\text{of}\text{A}}{\text{Total}\text{number}\text{of}\text{outcomes}}$

The total number of car crashes is the sum of the number of cars that rolled over and the number that did not rollover.

It is calculated as follows:

$$\begin{gathered} \text{Total}\text{number}\text{of}\text{car}\text{crashes}=83600+5127400 \\ =5211000 \end{gathered}$$

The number of cars that rolled over = 83600.

Let E be the event of selecting a car crash resulting in a rollover.

The probability of E is calculated as follows:

$$\begin{gathered} P\left(E\right)=\frac{\text{Number}\text{of}\text{cars}\text{that}\text{got}\text{rolled}\text{over}}{\text{Total}\text{number}\text{of}\text{car}\text{crashes}} \\ =\frac{83600}{5211000} \\ =0.0160 \end{gathered}$$

Therefore, the probability of selecting a car crash resulting in a rollover is equal to 0.0160.

An event is unusual if the chance of occurrence for an event is lesser than 0.05.

It can be said that there is a 0.0160 chance of a car getting rolled over in a crash. As the probability value is considerably low, it can be said that it is unlikely for a car crash to result in a rollover.