The line plots show the number of hours two different age groups of teenagers spent online the previous week. two line plots, both are labeled from twelve to thirty six going by ones underneath the line plot. the top line represents hours spent online parenthesis ages thirteen to fifteen parenthesis. there are three xs over twenty eight, two xs over twenty seven and one x over twenty one, twenty four, twenty six, thirty one and thirty four. the bottom line represents minutes spent online parenthesis ages sixteen to eighteen years old parenthesis. there are four xs over twenty eight and one x over twelve, twenty one, twenty seven, thirty point five, thirty four, thirty five and thirty six. select from the drop-down menus to complete each statement. the range is . the mean