$\"\"$

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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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Add: $\"\"$ .

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$\"\"$

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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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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Add: $\"\"$ .

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$\"\"$

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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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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$\"\"$ . (Apply square root of each side) $\"\"$

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The variance is 8.25, standard deviation 2.87228.