Is the randomness in Heisenberg's uncertainty principle due to inability to measure or actually randomness?

Is the randomness in Heisenberg's uncertainty principle due to inability to measure or actually randomness?
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Answer :

answer:It’s inherent randomness—at least empirically. Here’s a quote from the Wikipedia article on the Uncertainty principle: Albert Einstein believed that randomness is a reflection of our ignorance of some fundamental property of reality, while Niels Bohr believed that the probability distributions are fundamental and irreducible, and depend on which measurements we choose to perform. Einstein and Bohr debated the uncertainty principle for many years. Anyhow, a physicist can very precisely calculate the probability of some event (such as radioactive decay) and verify this calculation in the lab with great precision. Yet every event is still completely unpredictable, like the roll of dice.
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