Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 3 - No. 3)
When calculating the mean from a frequency table, what must you do with the midpoints of the classes and their frequencies?
Add the midpoints together and divide by the total frequency.
Multiply each midpoint by its frequency, sum the products, and divide by the total frequency.
Divide each midpoint by its frequency and sum the results.
Subtract the frequencies from the midpoints.
Explanation
The mean is calculated by multiplying the midpoint of each class by its corresponding frequency, summing those products, and dividing by the total frequency.
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