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• For example: if a student got a mark of 84 in their English class (the class had mean of $$73$$ and standard deviation of $$9$$), and a mark of $$79$$ in their maths class (class mean of $$70$$ with a standard deviation of $$7$$), in which class did the student do better in?
$\frac{84-73}{9} \approx 1.22 \mbox{ standard deviations from the mean.}$
$\frac{79-70}{7}\approx 1.29 \mbox{ standard deviations from the mean.}$