It is the closeness of the agreement between the result of a measured value and a true value.

• A. Accuracy
• B. Precision
• C. Mean
• D. Error

Answer: (A)

Closeness of agreement between a measured value and the true value is accuracy. This tells you how correct your measurement is when compared to the standard or true value, reflecting bias or systematic error that might pull the result away from the target. Precision, on the other hand, describes how repeatable or consistent your measurements are with each other, even if they’re not hitting the true value. The mean is simply the average of multiple measurements and doesn’t by itself indicate how close those measurements are to the true value. Error means the difference between a measurement and the true value, which is related to accuracy but is the gap itself rather than a descriptor of overall measurement quality.