This type of sampling is known as a voluntary sampling.
Step-by-step explanation:
The voluntary sampling method is a sampling method where people are themselves interested in the survey topic. The people self elect themselves to conduct this kind of survey. For example, the reality shows asks their viewers to participate in an on-line poll.
Paul can type 60 words per minute and Jennifer can type 80 words per minute. Paul typing speed / Jenifer typing speed = 60/80 = 3/4. Paul type 3/4 as fast as Jennifer. Log in for more information.