Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 7 - No. 10)
Which of the following steps are necessary when calculating the mean for grouped data?
Finding the midpoint of each class interval
Multiplying the midpoint of each class interval by its frequency
Dividing the result by the number of intervals
Summing all the frequencies
Explanation
You need midpoints, frequencies, multiply each of the midpoint by the corresponding frequency, and divide the sum of (midpoint x frequency) by the total frequency.
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