3.一个地区的人均XX是用XX的总量除以总人口。已经某地区的XX总量,rounded to the nearest 1,000,000,000 is 43,000,000,000, while the population of this area, when rounded to the nearest 1,000,000 is 860,000,000. Is 人均XX within $5 of $500 in this area?
我认为rounded to the nearest 1,000,000,000 is 43,000,000,000, 这时的43,000,000,000 的取值范围应是43,499,999,999~42,500,000,000 而同理rounded to 1,000,000, 则 860,000,000的取值应是864,999,999~859,500,500 而不是机经中所说43,000,000,000可以是大于等于42500,000,000小于43500,000,000之间的数近似出来的;同理860,000,000也是大于等于855,000,000小于865,000,000. 请问我的看法有误吗?