Final answer:
Rosencrantz and Guildenstern's report in Hamlet reveals that Hamlet firmly believes in the existence of ghosts, which informs his actions and motivations.
Step-by-step explanation:
Rosencrantz and Guildenstern's report in Hamlet provides insight into Hamlet's behavior and state of mind. In lines 7-10, they mention that Hamlet believes that around 75 out of 100 people have encountered a ghost. This shows that Hamlet firmly believes in the existence of spirits, contrary to what Polonius thinks. Hamlet's belief in ghosts is significant because it shapes his actions and motivations throughout the play.