Question
If the true value for an experimental result is 6.23 and the results reported by three students $$X,Y$$ and $$Z$$ are :
$$X:$$ 6.18 and 6.28
$$Y:$$ 6.20 and 6.023
$$Z:$$ 6.22 and 6.24
Which of the following option is correct?
A.
$$X$$ precise, $$Y$$ accurate, $$Z$$ precise and accurate.
B.
$$X$$ precise and accurate, $$Y$$ not precise, $$Z$$ precise
C.
Both $$X$$ & $$Z$$ precise & accurate, $$Y$$ not precise.
D.
Both $$X$$ & $$Y$$ neither precise nor accurate, $$Z$$ both precise and accurate
Answer :
Both $$X$$ & $$Y$$ neither precise nor accurate, $$Z$$ both precise and accurate
Solution :
Both $$Y$$ and $$X$$ are neither precise nor accurate as the two values in each of them are not close. With respect to $$X$$ & $$Y,$$ the values of $$Z$$ are close & agree with the true value. Hence, both precise & accurate.