An intern is working for Pacific TV (PTV), a small cable and
Internet provider, and has proposed some questions that might be
used to assess how much customers are willing to pay for a new PTV
service. The intern got a set of 12 with mean of $60.2 and standard
deviation of $14.5. How many customers the intern should interview
if PTV asks for 80% confidence within 2 units?
Group of answer choices
87
98
345
391