Yes. For example, if you want to calculate combination(6,2), press 6 and then press MATH. Use the arrow keys to scroll over to PRB at the top and select nCr. Then press 2. You should see:
6 nCr 2
Press ENTER.
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Press MODE and select NORMAL at the top. (You may notice that SCI was selected for scientific notation.)
Some TI83's can be set up differently, so it is highly recommendable to read the user guide for the TI83 in question. The user would need to go into the VarStat option and enter all the appropriate fields to have the calculator bring in the appropriate variables and totals.
"Brown" & "Vita"
there is no percent button... just use the decimal button and then move the decimal two places down
press shift equal next to the backspace button >+