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A student measures the lifetime of a cosmic ray muon, on 4 trials to be: ?=2.1??,...

A student measures the lifetime of a cosmic ray muon, on 4 trials to be: ?=2.1??, 2.3??, 2.0??, 2.4??. From this she deduces that ?=2.20?s. What is her estimated uncertainty for this value?

Answer in ?? and use one significant digit.

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