Question

Keiko estimated the height of her office building to be 45 ft. The actual height of her office building is 42 ft

Find the absolute error and the percent error of Keiko's estimate. If necessary, round your answers to the nearest tenth.

Answer 1

% error formula: | true value minus "your" (as in Keiko's) value | over true value, times 100.

so: 42 - 45 = 3 (it would be negative but we used absolute value, which is how it is supposed to be done. 3 is your absolute error).

3/42 = 0.07143

0.07142 * 100 = 7.142%. she was only 7.142% off from the right answer.