Ari measured the density of quartz three times: 2.49 g/cm3, 2.56 g/cm3, and 2.72 g/cm3. The accepted value is 2.65 g/cm3. What is the percent error of Ari's average measurement?

The answer to your question is: 2.26%

Step-by-step explanation:

Data

densities 2.49 g/cm3, 2.56 g/cm3, 2.72 g/cm3

accepted value = 2.65 g/cm3

Process

mean = (2.49 + 2.56 + 2.72) / 3 = 7.77 / 3

= 2.59 g/cm3

% error = | approx. - exact| / exact x 100

% error = | 2.59 - 2.65 | / 2.65 x 100

% error = | - 0.06| / 2.65 x 100

% error = 0.06/2.65 x 100

% error = 2.26 %