Question

Lizzie measured the length of a trail near her house. She discovered that her measurement had a margin of error of 0.0005 mile. Which of the following could be the measured length of the trail?
7.25 miles
7.2537 miles
7.253 miles
7.3 miles

Answer 1

the error is half the smallest unit of measurement.

since the error is to 4 decimal places.... it means the doubling the error will given the number od decimal places in the actual measurement.

0.0005 x 2 = 0.001

so look for the answer with 3 decimal places