Question

Four screw gauges are to be calibrated to the standard thickness $t_{st}$ of a wire. Series of measurements were performed by each instrument to obtain a distribution of the measured values as shown.


Which of the following statements is correct?

• A. Screw gauge 1 is less precise but more accurate than screw gauge 4
• B. Screw gauge 2 is more precise but less accurate than screw gauge 3
• C. Screw gauge 1 is more precise and more accurate than screw gauge 3
• D. Screw gauge 2 is less precise and less accurate than screw gauge 4

Answer 1

The correct option is A Screw gauge 1 is less precise but more accurate than screw gauge 4

1 is more accurate than 2 & 4; 3 is more accurate than 2 & 4
3 is more precise than 1 & 2 ; 4 is more precise than 1 & 2