Q. 14.2( 76 Votes )
Two students performed the same experiment separately and each one of them recorded two readings of mass which are given below. Correct reading of mass is 3.0 g. On the basis of given data, mark the correct option out of the following statements.
A. Results of both the students are neither accurate nor precise.
B. Results of student A are both precise and accurate.
C. Results of student B are neither precise nor accurate.
D. Results of student B are both precise and accurate.
When it comes to understanding results of measurements, the terms precision and accuracy are used. Precision refers to the closeness of various measurements for the same quantity while accuracy is to show whether the particular value is true to the value of the result.
The average reading of Student A is 3.01 + 2.99/2 = 3.00
The average reading of Student B is 3.05 + 2.95/2 = 3.00
The average value of both students is close to the true value, hence both students have accurate results. However, the values of student A are close to each other as well as the average value, with the difference of the two results being 0.02. As for the values of student B the values are relatively farther, with the difference between the two values being 0.1.
Hence the results of student A are precise. The correct option is (ii).
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