Final answer:
The weight of the contents in the container, to the nearest pound, is 274 lb.
Step-by-step explanation:
To find the weight of the contents in the container, we first need to calculate the volume of the container. The volume of a right rectangular prism is found by multiplying its length, width, and height. So, the volume of the container is 13 ft * 4.5 ft * 6 ft = 351 ft³.
Next, we multiply the volume of the container by the weight per cubic foot to find the weight of the contents. 351 ft³ * 0.78 lb/ft³ ≈ 273.78 lb.
Therefore, the weight of the contents in the container, to the nearest pound, is 274 lb.