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The question does appear to be a little bit loose in its definitions. "Average" probably means "Mean" and your figure of 7.778 is correct. The average deviation of the set possibly means the mean deviation from the known value, which works out as 0.14 . The relative average possibly means the mean deviation from the mean of the set, which works out as 0.1264, or 12.64% . Research on the 'net was not entirely fruitful. Comments from an actual chemist (your teacher?) would be welcome.

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