The mean of five observation is 10 if each observation of data is increased by 5 find its mean
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Multiplying each observation by 5 will cause the mean to be 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 '5r + 1'.
The cumulative effect will take the mean 'r' to '5r + 1'.
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