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Reaction time studies report both central tendency and variability, because inconsistency is itself informative. Four trials averaging 303.5 ms with a standard deviation of 30.3 ms give a coefficient of variation of 10%. Simple visual reaction time averages 200-250 ms in young adults, and elevated variability is a recognised marker of attentional lapses.
Mean
mean = sum of trial times / number of trials
Coefficient of variation
CV = standard deviation / mean x 100%
Because intra-individual variability rises with fatigue, ageing and attentional disorders, often before the mean changes measurably.
About 200-250 ms to a visual stimulus and 150-200 ms to an auditory one, since sound reaches the cortex faster.