Division Formula 7

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s_{\bar{η_{{MG}_{i}}}} = \frac{s_{\bar{η_{{MG}_{i}}}}}{\sqrt{m}} = \sqrt{\frac{\sum_{m}^{j = 1} {(η_{{MG}_{i_{j}}} - \bar{η_{{MG}_{i}}})}^{2}}{m (m - 1)}}

The standard deviation of the efficiency value of the efficient 12 V motor generator ( $s_{η_{MG}}$ ) shall be calculated in accordance with the following Formula 8: