be the mean of the new full
. The mean of 20 numbers is 18. If 3 is added to each of the first ten
numbers, find the mean of the new set of 20 numbers.
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The mean of 20 numbers is 18. Hence the sum of the 20 numbers is 20*18 = 360. By adding 3 to the first 10 numbers the new sum becomes 360 + 3*10 = 360 + 30 or 390. Dividing the new total by 20 we get 390/20 = 19.5 as the new mean of the 20 numbers.
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