Final answer:
The probability of all three people wearing their seat belts is approximately 37.32%, which is somewhat likely to occur.
Step-by-step explanation:
To find the probability that all three people wear their seat belts, we multiply the probabilities of each person wearing a seat belt together. The probability that one person wears a seat belt is 72%, so the probability that all three people wear their seat belts is (0.72) * (0.72) * (0.72) = 0.373248, or approximately 37.32%.
This probability can be considered somewhat likely to occur, as it is above 30%. However, it is not extremely likely, as it is still less than 50%.