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AMC10 2010 A

AMC10 2010 A · Q1

AMC10 2010 A · Q1. It mainly tests Fractions, Averages (mean).

Mary’s top book shelf holds five books with the following widths, in centimeters: 6, $\frac{1}{2}$, 1, 2.5, and 10. What is the average book width, in centimeters?
Mary 的顶层书架上有五本书,它们的宽度(厘米)分别是:6、$\frac{1}{2}$、1、2.5 和 10。这些书的平均宽度是多少厘米?
(A) 1 1
(B) 2 2
(C) 3 3
(D) 4 4
(E) 5 5
Answer
Correct choice: (D)
正确答案:(D)
Solution
Answer (D): The average of the five values is $\dfrac{6+0.5+1+2.5+10}{5}=\dfrac{20}{5}=4$.
答案(D):这五个数的平均值是 $\dfrac{6+0.5+1+2.5+10}{5}=\dfrac{20}{5}=4$。
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