Question

The density of copper is listed as 8.94g/cm​ 3​ . Two students each make three density determinations of samples of the substance. Student A's results are 7.3g/mL, 9.4g/mL, and 8.3g/mL. Student B's results are 8.4g/cm​ 3​ , 8.8g/cm​ 3​ , 8.0g/cm​ 3​ . Compare the two sets of results in terms of precision and accuracy.

Answer 1

Answer:

Density of the copper = 8.94g/cm^3

Student A results = 7.3gm/cm^3 ,9.4 gm/cm^3 , 8.3gm/cm^3

Student B results = 8.4 gm/cm^3 , 8.8 gm/cm^3 , 8gm/cm^3

From the observations we conclude that

Student A's result is accurate but not  precise as the trials noted are not close to each other.

Student B's result is accurate and precise as the trials noted are close to each other.

Mean density of student A = 7.3 + 9.4 + 8.3 /3 = 8.33gm/cm^3

Mean density of student B = 8.4 + 8.8 + 8 /3 = 8.4 gm/cm^3

both the densities of A and B are 0.5 away from the actual density.