This means we can be almost certain that the true number lies between 4,820 and 15,940. Nobody would bet a dime on the outcome of an election where the prediction given by the polls carried a margin of error is half as large as the prediction. Serious injuries and deaths are extraordinarily rare in view of the large numbers of people exposed. More than 300 million people visit amusement parks every year. Roller coasters are supposed to seem scary, that's the whole point.
Golf is more dangerous.