请教AA039

The following appeared in an Avia Airlines departmental memorandum.

“On average, 9 out of every 1,000 passengers who traveled on Avia Airlines last year filed a complaint about our baggage-handling procedures. This means that although some 1 percent of our passengers were unhappy with those procedures, the overwhelming majority were quite satisfied with them; thus it would appear that a review of the procedures is not important to our goal of maintaining or increasing the number of Avia’s passengers.

First, the argument turns on the assumption that the 99 percent of Avia passengers who did not complain were happy with the airline’s baggage-handling procedures.

Secondly, in the absence of information about the number of passengers per flight and about the complaint records of competing airlines, the statistics presented in the memorandum might distort the seriousness of the problem

范文上的第二个错误是啥意思，我怎么没太看明白？？这道题除了第一个明显错误外，其他的错误都是怎么找的啊，请教NN，谢谢。

我还想了一个，不知道对不对。

“on average”：要是所有的complain都是由于system breakdown,有的航班出现很多问题，而有的时候根本没有问题，那样的话还是需要查一下的吧。

但是如果平均低，基数大，从风险管理的角度来说，完全可以撤销检查程序。所以论证的时候要小心哦