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StatisticsStatistics
Mean by Three Methods
Change class marks and frequencies to compare mean methods.
Controls
5
8
12
6
10
Live result
Class marks
5, 15, 25, 35
Σf
31
Σfx
655
Mean
21.129
Class 15
Class 28
Class 312
Class 46
Frequency distribution — mean & median markersClass marks: 5, 15, 25, 35
Direct, assumed-mean and step-deviation methods always give the same mean.