Mean of grouped data: step-deviation method (Assumed mean A, class width h, coded deviations u_i)
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Assumed mean A, class width h, coded deviations u_i
What each symbol means
| Symbol | What it stands for |
|---|---|
| h | Uniform class width |
| u_i | Integer step from A |
| x_i | Midpoint of i-th class |
When to use this
Equal class widths; midpoints x_i; any convenient A (often mid class).