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题库 / GMATLA-PS-177
Yesterday each of the 35 members of a certain task force spent some time working on project P. The graph shows the number of hours and the number of members who spent that number of hours working on project P yesterday. What was the median number of hours that the members of the task force spent working on project P yesterday?
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求median number 不是 mean！
35 people make a list. the median is the 18th people. from the least to the greatest, 9(pax)+4pax+1pax+2pax+1pax=17pax, then the 18th people begin from the members who use 6 hrs. therefore the median is 6hrs.