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2. Find the Standard Deviation
Step 1:
Find the variance.
Step 2:
Take the square root of the variance.
mean= =11.5
Step 1:
Find the variance.
To calculate it, you take the difference of each number and the mean. Then you square them, and take the average.
3− − − − − − =
Step 2:
Take the square
root of the variance. σ= +
The standard deviation is used to find how spread out a set of numbers are.
123.5

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