$\"\"$

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The given statement is {4.3, 6.4, 2.9, 3.1, 8.7, 2.8, 3.6, 1.9, 7.2}.

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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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$\"\"$

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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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$\"\"$

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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 on each side) $\"\"$

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The variance is $\"\"$ , standard deviation $\"\"$ .