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Looks like I will have to answer my own question. When I posted it, I did not know the answer. However, my subsequent internet research revealed that there were approximately 500 empty seats total in the 18 lifeboats that were lowered.

I was also surprised to learn that in calm seas, it is possible to exceed the capacity of a lifeboat by about 15%. And my research indicates the seas where calm where and when the Titanic sank.

Sad to say, some of the crew that manned the lifeboats allowed them to be under capacity for fear of breaking in half when lowered. This proved to be unfounded in tests that were performed during the investigation afterwards.