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infoWhy this? Standardised scores express a value's position relative to its mean in standard deviation units, enabling comparisons across datasets with different scales or spreads. Quality control applies ideas about variation to monitor processes and identify results that may warrant investigation.

scheduleWhy now? Normal distributions provide a framework for interpreting standardised values and limits used in quality control. As the final unit, this brings together averages, dispersion, probability, and critical interpretation in practical applications.