成绩分布分析器
使用此成绩分布分析器深入分析数据并获取有用见解。
Class Average
80.2
Class Average vs Score 1
公式
## How to Calculate Class Average The class average (mean) is the sum of all scores divided by the number of students. ### Formula **Average = Sum of Scores / Number of Students** **Standard Deviation = sqrt(Sum of (Score - Mean)^2 / N)** The standard deviation tells you how spread out the scores are. A smaller SD means students performed more uniformly.
计算示例
Six student scores: 85, 72, 91, 68, 77, 88.
- 01Total: 85 + 72 + 91 + 68 + 77 + 88 = 481
- 02Average: 481 / 6 = 80.2
- 03Highest: 91, Lowest: 68
- 04Variance: ((4.8^2 + 8.2^2 + 10.8^2 + 12.2^2 + 3.2^2 + 7.8^2) / 6) = 72.8
- 05Standard deviation: sqrt(72.8) = 8.53
常见问题
Is the average always the best measure?
No. If scores are heavily skewed or have outliers, the median may better represent typical performance.
What does a high standard deviation mean?
A high SD means scores are widely spread. This could indicate varied preparation levels or an assessment with a wide difficulty range.
How many scores can I enter?
This tool supports 6 scores. For larger classes, use a spreadsheet or enter representative sample scores.