Final answer:
The correct accident class depends on the specific classification system used by the insurance company or regulatory body.
Step-by-step explanation:
The correct accident class for an accident in which five workers are hospitalized, there are no fatalities, and property damage amounts to approximately $650,000 would depend on the specific classification system used by the insurance company or regulatory body. Accident classes typically range from minor accidents with no injuries or minimal damage to catastrophic accidents with multiple fatalities and extensive property damage. Without further information about the specific classification system being used, it is not possible to determine the exact accident class for this scenario.