Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 5 - No. 27)
If the mean of a set of data is 25 and the sum of the data values is 100, how many data points are in the set?
2
4
5
75
Explanation
Mean = Sum of values / Number of values. Therefore, 25 = 100/Number of values. Number of values = 100 / 25 = 4
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