Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 2 - No. 13)
In a frequency table, what do you use to find the mean?
Add up all the frequencies.
Multiply the class widths by the frequencies.
Multiply the midpoints by the frequencies and divide by total frequency.
Divide the total frequency by the number of classes.
Explanation
The mean is estimated using midpoints and frequencies.
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