Each of the following frequency tables represents a data set. Which data set has the greatest mean?
Table A data: (10,3),(20,4),(30,5),(40,6)
Table B data: (10,5),(20,5),(30,5),(40,5)
Table C data: (10,6),(20,4),(30,4),(40,6)
Table D data: (10,7),(20,3),(30,3),(40,7)
