Question

two distribution with 100 and 200 time have a mean of 20 and 10 .find the combined mean of two distribution

Answer 1

More formally, a combined mean for two sets can be calculated by the formula
combined mean:


Where:

xa = the mean of the first set,
m = the number of items in the first set,
xb = the mean of the second set,
n = the number of items in the second set,
xc the combined mean.
A combined mean is simply a weighted mean, where the weights are the size of each group.

For more than two groups:

Add the means of each group—each weighted by the number of individuals or data points,
Divide the sum from Step 1 by the sum total of all individuals (or data points).

Answer 2

Answer:

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Explanation:

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