Answer:
- C. 15.5 pounds
- D. 8.0 pounds
Explanation:
Anything expressed to a precision smaller than 10 pounds will be more precise. Choices C and D are both expressed to a precision of 1/10 pound, so are more precise than a weight expressed to the nearest 10 pounds.
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The convention for indicating that the 0 in 10 is significant is to write the number with a trailing decimal point: 10. pounds. Since the number here is not written that way, we must presume its precision is 10 pounds (not 1 pound). Both of the choices 50 and 30 suffer the same problem.