Read the following SAT test question and then click on a button to select your answer.

The graph above shows the distribution of the number of days spent on business trips in 2010 by a group of employees of Company W. Based on the graph, what is the median number of days spent on business trips in 2010 for these employees?

(A) 22
(B) 22.5
(C) 22.75
(D) 23
(E) 23.5

来源:可可英语 http://www.kekenet.com/sat/201410/333338.shtml