Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 9 - No. 8)
What do we calculate from the grouped data to estimate the mean?
The difference between the upper and lower boundaries of each interval
The sum of the midpoints
The sum of the midpoints multiplied by frequencies and divided by the sum of the frequencies
The frequency of each interval
Explanation
We multiply each midpoint by its corresponding frequency, sum these products, and divide by the total frequency.
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