The dot plot shows the number of hours, to the nearest hour, that a sample of 5th graders and 7th graders spend watching television each week. what are the mean and median?
the 5th grade mean is 3.76, 4.67, 5, 5.25
the 7th grade mean is 3.46, 3.76, 4, 4.72
the 5th grade median is 4, 5, 5.5, 6
the 7th grade median is 3, 3.5, 4, 4.5,