DNA analysis is the process in which genetic sequences are studied. It is used by law enforcement and medical personnel to identify a particular person or species, and even specific cancers and diseases. At one point the analysis process was very limited.
To round off to the nearest tenth, means to keep one decimal digit. (To round off to the nearest hundredth would mean to keep two digits; to the nearest thousandth, three; and so on. Now, the digit in the second decimal place is 5. Therefore add 1 to the previous digit 2.
The first few times, when I answered the calls, there was that weird mechanical pause, the one that tells you that the computer is alerting the telemarketing rep that they've got a live one. I waited patiently, and asked the telemarketer on the other end to tell me how they got my number.