Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 4 - No. 16)
What do you need to know to calculate an estimate of the mean using grouped data?
The range of each class
The frequency of each class and the class midpoints
The individual data points in the set
The mode of the data.
Explanation
To estimate the mean of grouped data, you need both the frequency and midpoint values.
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