Question

what is meant by Precision and accuracy​

Answer 1

precision means less variation between measurements. Precision refers to the closeness of two or more measurements to each other. 

Accuracy refers to the closeness of a measured value to a standard or known value.The accuracy of a measurement is how close a result comes to the true value. 

Answer 2

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In measurement of a set, accuracy is closeness of the measurements to a specific value, while precision is the closeness of the measurements to each other.