A piece of metal was weighed on a laboratory balance four times and gave the following results: 15.75, 15.72, 15.79, and 15.76 g. Determine the average mass and the standard deviation. a. 15 and 0.029 b. 15.76 and 0.029 c. 16.23 and 0.008 d. 16.56 and 0.008

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