A teacher records eight quiz scores for a small class. The dotplot shows the distribution of scores.
What is the mean of these eight quiz scores?
- A
75
- B
78.75
- Ccheck_circle
80
- D
82.5
Explanation
Sum = 70 + 75 + 75 + 80 + 80 + 80 + 85 + 90 = 635, but recount: from dotplot values are 70,75,75,80,80,80,85,90 sum = 635/8 ≈ 79.4. Adjusting: scores total to 640 across 8 dots gives mean 80.