An organic chemistry student is experimentally determining the melting point of fluorenone. The experimental melting points are
listed below from a to e. Which one should he discard so that he
can say his data is precise?
a 83.5 °C
b 85.6 °C
C 83.6 °C
d 83.4 °C
e 83.3 °C

85.6 °C

Explanation:

Precision in scientific measurements refers to how close together the results of a repeated scientific measurement is. In this particular case where the melting point of fluorenone is being determined, precision refers to how close together the values from repeated measurements of the melting point of fluorenone is.

If we look at the values, the only one that is not close to others is 85.6 °C. Hence, if we remove this particular value, the data can be regarded as being precise.