The dot plots below show the test scores of seventh- and eighth-grade students: dot plot for grade 7 shows 6 dots on score 50, 4 dots on score 60, 6 dots on score 70, and 4 dots on score 80. dot plot for grade 8 shows 7 dots on score 60, 4 dots on score 70, 4 dots on score 80, 3 dots on score 90, and 2 dots on score 100. based on visual inspection of the dot plots, which grade, if any, appears to have the higher mean score? grade 7 grade 8 both groups show about the same mean score. no conclusion about mean score can be made from the data.