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10 cards from this deck
mean = Σfx / Σf
Sum all values in the fx column.
It is the sum of all frequencies in the data set.
Add all values and divide by the number of values.
Multiply midpoints by frequencies, then divide by total.
Sum all the values in the data set.
Always multiply each x-value by its frequency first.
Errors in multiplication can lead to wrong mean.
Calculate it by adding all frequencies.
No, the mean can be different from original values.
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