Question

Intuition for weighted average. Why $\frac{w_1}{w_1 + w_2}x_1 + \frac{w_2}{w_1 + w_2}x_2 = \frac{\sum_i w_ix_i}{\sum_i w_i}$?

score 736 · Answer 1 · 2020-07-06 14:56:57

736

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Intuition for weighted average. Why $\frac{w_1}{w_1 + w_2}x_1 + \frac{w_2}{w_1 + w_2}x_2 = \frac{\sum_i w_ix_i}{\sum_i w_i}$?

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score 51 · Answer 2 · 2026-03-28 02:10:37

51

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score 45 · Answer 3 · 2020-07-16 00:18:19

45

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718

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26

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List Question

Intuition for weighted average. Why $\frac{w_1}{w_1 + w_2}x_1 + \frac{w_2}{w_1 + w_2}x_2 = \frac{\sum_i w_ix_i}{\sum_i w_i}$?

Formula for calculating weighting percentages given individual grades and final grade

What is the correct calculation here?

solve statistical problem, which includes the arithmetic mean and variance

Average speed of train

A mean in which values are weighted by themselves

One number is removed from the set of integers from $1$ to $n.$ The average of the remaining numbers is $163/4.$ Which integer was removed?

Find points on a line

Average distance (maximum norm) from origin to the nearer of two random points in a unit square

achievability of average

How do I obtain the "final" standard deviation from a series of values containing individual (also null) SD values?

Find upper bound from average value

Removing my averages

Find the average value of the function...

Does Averaging the score from correlation across multiple variables yield a more accurate correlation score?

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