What will be probability of no a value without any distribution in a range?

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A regression equation of $Y=100+20X$ at which observation is made on $x=5$ for which $Y=200$. No distribution of $Y$ is specified although Regression equation is assumed to follow normal but here in this case we have to assume $Y$ without any distribution. What will be the exact probability of $Y$ to fall between $195$ to $205$?