Martha estimated there were 86 marbles in a jar for a contest. The actual number of marbles in the jar was 108. What was the percent error of Martha's estimation?

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Mathematics

Francisco Adkins

29 June, 15:21

Martha estimated there were 86 marbles in a jar for a contest. The actual number of marbles in the jar was 108. What was the percent error of Martha's estimation?

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Emily Bowman · Answer 1

So she thinks it is 86 out of the 108, giving you a fraction of 86*100/108 = 4300/54 or 79.6% which is how much she is correct and hence she is 100-79.6 = 21.4% wrong.