Accuracy is how close an experimental reading or calculation is to the true value. Lack of accuracy may be due to error or due to approximation. The less total error in an experiment or calculation, the more accurate the results. Error analysis can provide information about the accuracy of a result.
If you buy several items, all of which are subject to a sales tax, then you can calculate the total tax by summing the tax on each item. However, for the total tax to be accurate to the penny, you must do all the calculations to an accuracy of tenths of a penny (in other words, to three significant digits), then round the sum to the nearest penny (two significant digits). If you calculated only to…
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