$\"\"$

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The given statement is $\"\"$

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Find the mean:

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$\"\"$ (Mean formula)

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$\"\"$

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$\"\"$ (Add)

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

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$\"\"$

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Find the standard deviation:

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$\"\"$ (Take the square root of each side)

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$\"\"$ .

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$\"\"$

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The variance is 72.916, standard deviaion 8.539.