The mean of 20 items of a data is 5; and if each item is multiplied by 3, then the mean will be
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The mean of 20 items of the given data is 5. Now each item is multiplied by 3. ... Then the sum of all 20 terms can be obtained by multiplying 20 by mean 5. Hence, the sum of all 20 terms will be 20×5=100.
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