Mean of grouped data (direct method) (x̄ = Σ (frequency × class midpoint) / Σf)
jee-mainjee-advanced
x̄ = Σ (frequency × class midpoint) / Σf
What each symbol means
| Symbol | What it stands for |
|---|---|
| f_i | Frequency |
| x_i | Midpoint |
| \sum f_i | Total frequency |
When to use this
Continuous classes; x_i is midpoint.