Than all people will have to use metric measurement. Schools will have to provide special courses for teaching metrics, metric tools for measuring will have to be bought, and everything will have to be relabeled.
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But if all people use the metric system then you will have standard measurements! The question is about what will happen if you don't.
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6 millimetres is standard measurement!
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The answer depends on the individual measurement in question as well as the mean and standard deviation of the data set.
3x5 is the standard size as it closely follows the golden ratio