What percentage is the shaded area

Which of the following are accepted without proof in a logical system? check all that apply.

Plzzz answer both questions and i will give you 100 points

At the beginning of a call to the cable company, a message tells customers, "after you finish talking to our customer service representative, you will be asked to take a five-question survey about the level of service you recieved. it would be appreciated if you could stay on the line to answer the survey questions." what type of sampling is the cable company using?