The dot plots below show the test scores of sixth- and seventh-grade students:
Dot plot for Grade 6 shows 6 dots on score 70, 4 dots on score 80, 6 dots on score 90, and 4 dots on score 100. Dot plot for Grade 7 shows 5 dots on score 50, 7 dots on score 60, 4 dots on score 70, and 4 dots on score 80.
Based on visual inspection of the dot plots, which grade, if any, appears to have the higher mean score? Grade 6
Grade 7
Both groups show about the same mean score.
No conclusion about mean score can be made from the data.
1 answer
Based on visual inspection of the dot plots, Grade 6 appears to have the higher mean score. This is because Grade 6 has more dots clustered around higher scores (90 and 100), while Grade 7 has more dots clustered around lower scores (50 and 60).