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→Calculating the Average Relative Atomic Mass
To find the [[Mean Average|average]]:
: <math>Average=\tfracfrac{35+35+35+37}{4}</math>: <math>Average=\tfracfrac{35 \times 3 + 37 \times 1}{4}</math>
: <math>Average=35.5</math>
To find the [[Mean Average|average]]:
: <math>Average=\tfracfrac{7 \times 92.5 + 6 \times 7.5}{100}</math>
: <math>Average=6.925</math>
So the [[Relative Atomic Mass]] of [[Lithium]] is quoted as 6.9, 6.93 or 6.925 depending on the [[precision]] of that particular [[Periodic Table]].