Appendix A.6
Grouped Data Mean Calculator
Calculate the mean from a frequency distribution table using class midpoints.
InteractiveGrouped Data Mean Calculator
Formula:
Where = class midpoint, = frequency,
| Lower Limit | Upper Limit | Midpoint () | Frequency () | ||
|---|---|---|---|---|---|
| 14.5 | 72.5 | ||||
| 24.5 | 294 | ||||
| 34.5 | 276 | ||||
| Totals | n = 25 | 642.5 | |||
Estimated Mean:
25.7(Estimated Mean)
💡 Note: The midpoint is automatically calculated as . Since we don't know the exact values within each class, this mean is an estimate.