[tex] \large\underline \mathcal{{QUESTION:}}[/tex]
If the mean of 8 numbers is 135.6 and the mean of 12 numbers is 125.18, what is the mean of 20 numbers?
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[tex] \large\underline \mathcal{{SOLUTION:}}[/tex]
[tex] \boxed{ \begin{array}{} \sf mean = \frac{(8 \times 135.6) + (12 \times 125.18)}{20}\\ \\ \sf mean = \frac{1084.8 + 1502.16}{20} \: \: \: \: \: \: \: \: \: \: \: \\ \\ \sf mean = \frac{2586.96}{20} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \boxed{ \sf mean = 129.348} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \end{array}}[/tex]
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[tex] \large\underline \mathcal{{ANSWER:}}[/tex]
- The mean of the 20 numbers is 129.348
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