Final answer:
The important underwriting principle of group life insurance is Group risk pooling. This principle allows for the spreading of risk across a larger pool of people, which helps to lower the cost of insurance for individuals within the group.
Step-by-step explanation:
The important underwriting principle of group life insurance is Group risk pooling. Group risk pooling is the practice of combining the risks of a group of individuals to determine the insurance premium. This principle allows for the spreading of risk across a larger pool of people, which helps to lower the cost of insurance for individuals within the group.