Ncert Exercises & Solutions

Two students performed the same experiment separately, and each of them recorded two readings of mass, which are given below. The correct reading of mass is 3.0 g. On the basis of the given data, mark the correct option out of the following statements.

Students	Readings
	(i)	(ii)
A	3.01	2.99
B	3.05	2.95

1.	The results of both the students' are neither accurate nor precise.
2.	The results of student A are both precise and accurate.
3.	Student B's results are neither precise nor accurate.
4.	The results of student B are both precise and accurate.

Hint: If the calculated values are close to each other then calculated data is precise

The average value of A and B are as follows:

The average value of A =

\frac{3.01 + 2.99}{2}

= 3

The average value of B =

\frac{3.05 + 2.95}{2}

= 3

Both A and B average value is close to the accurate value. Hence, both values are accurate.

The gap between values of A and B is not much, hence, the values are precise.

Therefore, option second is the correct answer.

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