Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 8 - No. 31)
Which of the following is the correct order of calculations when estimating the mean for grouped data?
Find the midpoint, multiply by frequency, find the sum of midpoints and the sum of frequencies, then divide the midpoint sum by the frequency sum.
Find the midpoint, add all midpoints, divide by the number of classes.
Find the midpoint, multiply by frequency for each class, add the frequencies and divide by the number of classes.
Find the midpoint, multiply by frequency for each class, add the results, and divide by the sum of frequencies.
Explanation
The mean estimation involves finding the midpoint, calculating each product of midpoint * frequency, then summing and dividing by the total frequency.
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