Question

This is my friends answer. She needs help figuring out if she’s correct but I’m not sure! Is she correct? If not, what’s the answer?

Answer 1

(a) 2%; the marked answer is correct

Explanation:

You want the approximate error in an estimate of 5.5 cm when the actual piece measures 5.62 cm.

Error

The error is computed from ...

percent error = (estimate/actual -1) · 100%

percent error = (5.5/5.62 -1) · 100% ≈ -2.1%

The correct choice is 2%, choice A.

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Additional comment

The negative sign on the error indicates the estimate was lower than the actual value. For the purpose here, we're not concerned with the sign of the error.

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