Mean of 8 observation is 7.5 and mean of another 7 observation is 15. Find mean of all 15 observation
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Multiplying each observation by 7.5 will cause the mean to be 7.5 times what it was. Adding 1 to each sample will cause the sum of all samples to increase by N, where N is the total number of samples. Not surprisingly, this will raise the mean by 1 as well.
The cumulative effect will take the mean 'r' to '7.5r + 1'.
The cumulative effect will take the mean 'r' to '7.5r + 1'.
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