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What's in a number interpretation

Which of the following interpretations of the plot is not valid?

50 XP

Given that an email contains a small number, it is more likely to be not-spam.

Given that an email contains no number, it is more likely to be spam.

Given that an email contains a big number, it is more likely to be not-spam.

Within both spam and not-spam, the most common number is a small one.