It would only be a normal distribution if the marbles were manufactured with a process that allowed a normal distribution of sizes to be created. What if there were only two marble machines at the factory, highly precise, and one makes marbles 1/100th of a mm smaller diameter with an error of +/- 1/10000th mm? Then, the marbles would fall into two bins, unless you had a marble sorting machine that could detect <1/10000th difference. So, that was my long, engineering way of saying I agree with your statement.
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