the mean of 13 numbers is 18 what will be the new mean if each observation is increased by 2
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The mean of 13 numbers is 18.
Therefore, the sum of the 13 numbers is 13×18= 234
Each number is increased by 2, so the new sum of numbers is 234+(13×2)=260
Hence, the new mean = 260÷13= 20
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