To compute a 5-number summary on a TI-83 calculator, first enter your data into a list. Press the STAT button, select EDIT, and input your data into L1. After entering your data, press STAT again, scroll to CALC, and select 1-Var Stats. Choose L1 (or the list you used) and press ENTER. The output will display the minimum, first quartile (Q1), median (Q2), third quartile (Q3), and maximum, giving you the 5-number summary.
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