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Sum of 18 numbers = (18 × 12) = 216 After addition of 2 to each of the numbers, New sum = 216 + (18 × 2) = 252 So, required mean = (252/18) = 14 Alternate Solution Since, each number is increased by ‘2’. So, mean will also increase by ‘2’. So, required mean = 12 + 2 = 14
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