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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. 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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Correct Answer - 19.5
New mean =` ((20 xx 18) + ( 3 xx10))/20 = 390/20 = 39/2 = 19.5 `
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