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The variance of a sample of 169 observations equals 576. The standard deviation of the sample equals:

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The standard deviation is the measure of how the data differs from the mean. The equation is as follows:

The equation inside the square root is the equation for the variance.

There for the answer is the 24.

by Wooden (632 points)
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The standard deviation of the sample equals 24. The square root of 576.
by Wooden (484 points)
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standard deviation is the squre root of a given sample space which is 24 at this case
by Wooden (432 points)

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