@nybard please watch the video explanation for this question by selecting the â–¶ï¸ button in the top right hand corner of the screen when viewing this question.
Hope it helps! Let us know if you have any other questions.
JayDee8732September 8, 2017
I seen the explanation and I still don't get it. How can you conclude that most mail is incorrectly address from the statement that from stating that most mail arrives late?
francoOctober 10, 2017
I don't understand how you can conclude D if you stated that we don't know anything about incorrectly addressed mail in B
MehranOctober 10, 2017
Hi! Thanks for your posts.
This is a Must Be True question, and so the correct answer must have textual support from the stimulus.
The stimulus presents a set of facts (no argument). There are three facts given.
First, that nearly all the mail that IS correctly addressed arrives at its destination within two business days of being sent. You can diagram this as: MCA-most-(less than or equal to) 2 days
Second, that correctly addressed mail takes more than two business days only when it is damaged in transit. You can diagram this as: MCA > 2 days ==> DT ("only when" = necessary condition)
Third, most mail (in general, not speaking only about correctly addressed mail here) arrives three or more business days after being sent. You can diagram this as: M-most-(greater than or equal to) 3 days
Answer choice (D) must be true because of the combined impact of statements 1 and 3. If it is true that most correctly addressed mail arrives within two business days, but also true that most mail generally arrives three or more business days after being sent, then it must be true that a large proportion of mail is incorrectly addressed. This is the only way that both facts can be true.
Think about it this way. "Most" means "more than half." If more than half of all mail takes three or more days to arrive, and more than half of all correctly addressed mail arrives in two days or less, then the only way for both of these statements to co-exist is if a large proportion of mail is incorrectly addressed. Otherwise, you just would not have enough mail taking three or more days to arrive (since most correctly addressed mail takes two days or less).
Regarding answer choice (B), we do not know any affirmative rules about incorrectly addressed mail. In other words, we don't know anything about what happens to incorrectly addressed mail based on the facts presented in the stimulus. This does not mean, however, that the facts presented in the stimulus do not establish that there is, in fact, a significant amount of incorrectly addressed mail out there. For the reasons explained above, we know there has to be.
