Last year, Deanna bought 225 lamps when customers needed 250 lamps. This year, she bought 300 lamps but only sold 200 lamps. Which set of statements about the percent errors for the two years is true?
Answer
A
The percent error for this year was lower. Deanna estimated better last year.
B
The percent error for this year was higher. Deanna estimated better last year.
C
The percent error for this year was lower. Deanna estimated better this year.
D
The percent error for this year was higher. Deanna estimated better this year.
Explanation
Percent error is the absolute difference between the estimate and the actual amount, divided by the actual amount. Last year it was |225 − 250| ÷ 250 = 10%; this year it was |300 − 200| ÷ 200 = 50%. This year’s percent error was higher, so Deanna estimated better last year: choice B.
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