2. (14 points) A poll agenCy reports that 38% of teenagers aged 12-17 own smartphones. A random sample of 120 teenagers is drawn. Round your answers to at least 2 decimal places. (a) Which distribution or method do you use for caICulating the probability of a proportion? (b) What assumptions need to be met to use that method for proportions? (c) Does this example meet those aSSumptions? (d) If so, find the mean yr