Final answer:
Round-off errors occur when measuring the distance a long jumper has jumped and can impact the accuracy of the measured value.
Step-by-step explanation:
The round-off errors when measuring the distance a long jumper has jumped are uniformly distributed between 0 and 4 mm.
Round-off errors occur due to limitations in measurement precision, and they can impact the accuracy of the measured value. In this case, the round-off errors can affect the accuracy of the distance measured for the long jumper's jump.