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

User Blmage
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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.
User Paul Smith
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