the mass of an unknown substance is 2.86g. which of the following sets of measurement represents the value with both accuracy and precision?
a. 1.78 g, 1.80 g, 1.76 g, 1.81 g
b. 1.98 g, 2.02 g, 1.96 g, 2.01 g
c. 2.85 g, 2.86 g, 2.84 g, 2.81 g
d. 2.81 g, 1.98 g, 2.40 g, 2.78 g
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