Discussion
Find the weighted mean of the following data: Value(x) = {10, 20}, Weight(w) = {2, 3}.
Answer: B
\[ \bar{x} = \frac{\sum wx}{\sum w} = \frac{10(2) + 20(3)}{2 + 3} \]
\[ = \frac{80}{5} = 16 \]
The plain average would be 15; the heavier weight on 20 pulls it up.
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