NEST2026ChemistrySome Basic Concepts of Chemistry
Two students (P and Q) independently made three measurements (denoted by I, II, and III) of the same property. The expected correct value is 9.0 . The observed values by the students are provided in the given table. Student I II III Average P 8.9 9.1 9.0 9.0 Q 8.0 9.0 10.0 9.0 Based on the given data, the correct statement is:
Options
- AP is more accurate but less precise than Q.
- BBoth P and Q are equally accurate but P is more precise than Q.
- CBoth P and Q are equally precise but P is more accurate than Q.
- DP is less accurate but more precise than Q.
Correct answer
B. Both P and Q are equally accurate but P is more precise than Q.
Step-by-step solution
Accuracy is a measure of how close the average of the measured values is to the true value. The expected correct value is 9.0 . The average value for both students P and Q is 9.0 . Thus, both P and Q are equally accurate. Precision is a measure of how close the individual measurements are to each other. The measurements of student P ( 8.9 , 9.1 , 9.0 ) are much closer to each other compared to the measurements of student Q ( 8.0 , 9.0 , 10.0 ). Thus, P is more precise than Q. Therefore, both P and Q are equally acc