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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.

User Fishfood
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x - sum of 20 numbers


(x)/(20)=18\\ x=360\\\\ (x+3\cdot10)/(20)=(x+30)/(20)\\ (360+30)/(20)=(390)/(20)=19.5
User Cintia
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