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Define accuracy and precision

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1) Accuracy: It is the closeness of an instrument reading with the true value of the quantity under measurement. 

OR 

It is defined as the ability of a instrument to respond to a true value of a measured variable under reference conditions. 

2) Precision: It is measure of the reproducibility of the measurements; i. e. given a fixed value of a quantity, precision is a measure of the degree of agreement within a group of a measurement of the same quantity. 

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