How do you find the standard deviation of the sum of 4 random variables?

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asked Jul 6, 2023 93.2k views

1 Answer

Paul Smith · Answer 1 · 2023-07-13T08:03:52+0000

Standard deviation:

Step 1: Find the mean.
Step 2: For each data point, find the square of its distance to the mean.
Step 3: Sum the values from Step 2.
Step 4: Divide by the number of data points.
Step 5: Take the square root.

How do you find the standard deviation of the sum of 4 random variables?

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