Define the term standard deviation.

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Solution

The spread of statistical data is measured by the standard deviation. Distribution measures the deviation of data from its mean or average position. The degree of dispersion is computed by the method of estimating the deviation of data points. It is denoted by the symbol $‘ σ ’$ .

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Coefficient of variation can be defined as C.V = $\frac{σ}{x} \times 100$ , $¯ x$ $\neq$ 0, $σ$ = standard deviation and $¯ x$ = mean

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