manager for all sales of handheld devices, Mary Kerwin. Kerwin received the following data for November operations: (Click the icon to view the financial data.) Requirement Show November results tor digital cell phones. (tnter untavourable varances with a minus sign or parentheses.) Show November results for the total cell phone product line. (Enter unfavourable variances with a minus sign or parentheses.) Show November results for all handheld devices. (Enter unfavourable variances with a minus sign or parentheses.) Should Kerwin investigate the performance of digital cell phone operations? Why or why not? the performance of digital cell phones. manager for all sales of handheld devices, Mary Kerwin. Kerwin received the following data for November operations: (Click the icon to view the financial data.) Requirement Show November results tor digital cell phones. (tnter untavourable varances with a minus sign or parentheses.) Show November results for the total cell phone product line. (Enter unfavourable variances with a minus sign or parentheses.) Show November results for all handheld devices. (Enter unfavourable variances with a minus sign or parentheses.) Should Kerwin investigate the performance of digital cell phone operations? Why or why not? the performance of digital cell phones