Fill in the blank. AT &T would like to investigate if brand of smartphone and income level are independent variables. The accompanying contingency table shows the number of customers who own three brands of smartphones along with their income level. The expected number of customers who own Motorola smartphone and earn less than $50,000 is Eff Click the icon to view the contingency table. O A. 18.0 O B. 12.0 O C. 40.5 O D. 17.5 X Data table Smartphone Income Level iPhone Samsung Motorola Less than $50,000 15 20 15 $50,000-$100,000 15 50 25 More than $100,000 10 20 30 Print Done