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.
Or we can show the same thing this way: When we write numbers with tenths using decimals we use a decimal point and the tenths place to the right of this decimal point.The tenth place is immediately right of the decimal point. .1. one tenth. .2. two tenths.