Demand for Smartphones The following table shows worldwide sales of a type of phone and their average selling prices in 2012, 2013, and 2017. Year 2012 2013 2017 Selling Price p ($100) 4 3 2 Sales q (billions) 0. 6 1 2 Find the regression line (round coefficients to one decimal place). Q(p) = −0. 7x+3. 3 Incorrect: Your answer is incorrect. Use the regression line to estimate the demand (in millions of units sold) when the selling price was $350. M