Arithmetic mean for set one of observation is 20, and Arithmetic mean of whole 30 observations is 30 and the arithmetic mean of second 20 observations is ?
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The mean of set of 20 observations is 8.
Sum of the observations = 20×8=160
The mean of another set of 30 observations is 10
Sum of the observations = 30×10=300
Total number of observation = 20 + 30 = 50
Total sum of observations = 460
Combined mean =46050=9.2
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