Question

The weight of a rock sample is measured to be 2.5 pounds. What is the percent of error in the measurement?
2%
5%
10%

Answer 1

5

Step-by-step explanation:

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Answer 2

Answer:

2%

Step-by-step explanation:

The margin of error is understood to be half the value of the last significant place.

The last significant place for 2.5 pound is the tenths place.

A tenth is 0.1, so half of that is 0.05.

If 0.05 is the measurement error, the correct measurement will be:

$2.5+0.05=2.55$

or

$2.5-0.05=2.45$

So, percentage of error would be:

$\frac{2.55-2.5}{2.55} *100$

Similarly,

Percentage of error would be:

$\frac{2.5-2.45}{2.45} *100$

Which would equal 2% as your answer.

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