8 + 5.3 + 6.0 + 5.9 + 6.8 + 7.4 + 6.2}{7} = \frac{44.4}{7} = 6.34$
To calculate the standard deviation (SD), we first find the variance, which is the average of the squared differences from the mean. Then, we take the square root of the variance to get the
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