$\"\"$

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The statement is $\"\"$ .

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The mean formula is $\"\"$ , Where n is number of given values.

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Find the mean:

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Apply mean formula $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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The variance formula is $\"\"$ , Where $\"\"$ is mean value.

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Find the variance:

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ $\"\"$

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The standard deviation formula is $\"\"$ , Where $\"\"$ is mean value.

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Find the standard deviation:

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$\"\"$

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$\"\"$ . (Take square root each side) $\"\"$

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The variance is 423.9, standard deviation 20.5.