Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 8 - No. 36)
For continuous data presented in a frequency table, which values are used for calculating an estimate of the mean?
Class boundaries
Midpoints of the class intervals
Frequencies of the class intervals
The number of data points
Forklaring
The midpoints and the frequencies are used to calculate the mean, after multiplying the midpoints by their corresponding frequencies.