Three measurements 7.1J, 7.2J and 6.7J are made as experiment and added the result with correct number of significant figures is

7.1 J

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7.06 J

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7.0 J

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Solution

The correct option is C 7.0 J
Added result $R = 7.1 + 7.2 + 6.7 = 21$
All the three measurements have 2 significant figures, thus the added result must also have 2 significant figure.
Number of observations is $3$ .
Thus averaged result $R_{a v g} = \frac{21}{3} = 7.0 J$

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