Question

Given that, the true value for a result is $2.00\, g$. Three students $A, B$ and $C$ take two measurements and report the result, data to illustrate precision and accuracy as given below.

Student	Measurement(in g)
	$1$	$2$	Average (in g)
Student $A$	$1.95$	$1.93$	$1.940$
Student $B$	$1.94$	$2.05$	$1.995$
Student $C$	$2.01$	$1.99$	$2.000$

Which of the following students got the values which are both precise and accurate?

• A. Student $A$
• B. Student $B$
• C. Student $C$
• D. None of these

Answer 1

Answer: (C)

Given that, the true value for a result is $2.00\, g$ and student ' $A$ ' takes two measurements and report the result as $1.95\, g$ and $1.93\, g$. The values are precise as they are close to each other but are not accurate.
Another student $(B)$ repeats the experiment and obtains $1.94\, g$ and $2.05\, g$ as the results for two measurements. These observations are neither precise nor accurate.
The third student $(C)$ repeats these measurements and reports $2.01\, g$ and $1.99\, g$ as the result, these values are both precise and accurate.