Step 1 :Given the total number of passengers is 1942, the number of female passengers is 468, and the number of child passengers is 132.
Step 2 :We need to find the probability that a passenger selected at random was either a female or a child.
Step 3 :The probability of an event is calculated by dividing the number of ways the event can occur by the total number of outcomes.
Step 4 :In this case, the event is a passenger being a female or a child, and the total number of outcomes is the total number of passengers.
Step 5 :So, the probability of a passenger being a female or a child is \(\frac{468 + 132}{1942} = 0.30895983522142123\).
Step 6 :Rounding to three decimal places, the final answer is \(\boxed{0.309}\).