The following table shows mobile device usage by Black Friday shoppers from 2010 to 2015. The middle

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The following table shows mobile device usage by Black Friday shoppers from 2010 to 2015. The middle column lists the percentages of online site traffic due to mobile devices (rather than PCs), and the third column lists the percentages of online sales.image


Let x be the year and y the percentage of site traffic. Use linear regression to find f(x) = ax + b that models the first two columns. Predict the percentage of site traffic in 2016.

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