The first example, not naming a specific number, provides a very different vision of the scene.
If you say "five boys playing ball" then I see five individual boys and a static (snapshot)scene with them in the foreground and in clear visual focus.
If you say "five or six..." then I see a cloud of boys. They are in the background, not as much in focus, and they are in motion. This is not an exact science but it clearly sets a different view of the scene.
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