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 place to the right of the tenths has the digit 1. We round down which means the digit in the tenth place stays the same. 2.719 rounded to the nearest tenth is 2.7. The examples below show how the steps above can be applied when rounding to the nearest whole number, nearest tenth, and nearest hundredth.