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a
There is no difference between precision and accuracy
b
A good precision always means good accuracy
c
Accuracy means that all measured values of an experiment are close to the actual value.
d
A measurement may have good accuracy but poor precision
answer is C.
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Detailed Solution
Precision tells about the limit up to which a quantity can be measured using a given instrument. It tells us how close the measurements are of the physical quantity. Accuracy: It tells about the closeness of measured value with true value.