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Suppose an astronomer decides he wants to know the average orbital speed of Eris the dwarf planet. Using mechanical and astrophysical theories as well as observations, he determines that is average orbital speed is 3.32 ± 0.221 km/s. Assuming that Eris has an average orbital speed of 3.436 km/s, how far off (in %) is he from the correct orbital speed?

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