Question

Martha estimated there were 96 marbles in a jar for a contest. The actual number of marbles in the jar was 118. What was the percent error of Martha's estimation?

Answer 1

To find percent error, you subtract the actual number from your estimate, take the absolute value, and divide by the actual number.

l 96 - 118 l
l -22 l
l 22 l
l 22 l / 118
0.19% (this was rounded)

Hope this helps!