Anita made observations of the maximum temperature, $t{}^ \circ C$, on 50 days. Her results are summarised by $\sum {t = 910} $ and ${\sum {\left( {t - \overline t } \right)} ^2} = 876$, where $\overline t $ denotes the mean of the 50 observations. Calculate $\overline t $ and the standard deviation of the observations.
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