How many humans can fit inside of SpaceX's Starship, from Earth-to-Earth to Mars?

Elon Musk has mentioned fitting 100 people in a Starship to Mars, is that realistic? Let's look at the cruise industry, NASA standards, and other sources to get an idea of how much space is really required.
Video/ Image sources: SpaceX, NASA, Carnival Cruiselines.
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Видео How many humans can fit inside of SpaceX's Starship, from Earth-to-Earth to Mars? канала Roadster Tracker -Ben Pearson