AMC 8 1991 Problem 18

AMC8 1991 年第 18 题

统计与数据图表★★★☆☆

The vertical axis indicates the number of employees, but the scale was accidentally omitted from this graph. What percent of the employees at the Gauss company have worked there for 5 years or more?

纵轴表示员工数量，但此图意外遗漏了刻度。Gauss 公司员工中工作 5 年或以上的占百分之多少？

A.9%
B. $\displaystyle 23\frac{1}{3}\%$
C.30%
D. $\displaystyle 42\frac{6}{7}\%$
E.50%

正确答案 · Correct Answer

解析 · Solution

Solution 1

Let

x

be the number of employees represented by each

\text{X}

. The graph has a total of

30\text{X}

's, while the columns corresponding to 5 or more years at the company have a combined

9\text{X}

's. So of the

30x

employees,

9x

have worked at the company for at least 5 years, which is

\displaystyle \frac{9x}{30x} = \frac{3}{10} = 30\%

继续练习

免费刷 1991 整卷 →