Calculadora de Ajuste por Curva Normal
Ajuste notas da turma usando a curva de distribuição normal.
Class GPA
2.80
Class GPA vs Number of A Grades
Formula
## How to Analyze Grade Distribution Grade distribution shows how student performance is spread across letter grades. ### Formula **Percentage = Count at Grade / Total Students x 100** **Class GPA = (A x 4 + B x 3 + C x 2 + D x 1 + F x 0) / Total Students** A healthy distribution is roughly bell-shaped. Heavy concentrations at extremes may indicate assessment or instruction issues.
Exemplo Resolvido
A class of 30: 8 A's, 12 B's, 7 C's, 2 D's, 1 F.
- 01Total students: 8 + 12 + 7 + 2 + 1 = 30
- 02Grade points: 32 + 36 + 14 + 2 + 0 = 84
- 03Class GPA: 84 / 30 = 2.80
- 04A percentage: 8/30 = 26.7%, B: 40.0%, C: 23.3%
- 05Pass rate: 29/30 = 96.7%
Perguntas Frequentes
What is a normal grade distribution?
Many institutions see 15-25% A, 30-40% B, 20-30% C, and under 10% D/F combined for well-calibrated courses.
Is grade inflation a concern?
If over 50% of students receive A grades, it may indicate grade inflation, which reduces the ability to distinguish performance levels.
How should distribution inform teaching?
Bimodal distributions suggest some students may need additional support. Uniformly low grades may indicate instructional issues.