Question

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.

Student	Reading
	(i)	(ii)
A	3.01	2.99
B	3.05	2.95

• 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

Answer 1

Answer: (B)

Student $A: $ Average reading $= \frac{3.01+2.99}{2} = 3.0 \, g$
Student $B :$ Average reading$= \frac{3.05+2.95}{2} = 3.0 \, g$
For both the students $A$ and $B$, average reading is close to the correct reading (i.e., $3.0\, g$). Hence, both recorded accurate readings. But the readings recorded by student $A$ are more precise as they differ only by $± 0.01$, whereas readings recorded by the student $B$ are differ by $± 0.05$. Thus, the results of student $A$ are both precise and accurate.