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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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Accepted Answer

x - sum of 20 numbers[tex]\frac{x}{20}=18\\
x=360\\\\
\frac{x+3\cdot10}{20}=\frac{x+30}{20}\\
\frac{360+30}{20}=\frac{390}{20}=19.5[/tex]

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