Casio fx-991EX Quick Start Manual page 21

STATISTICS
13 different 1-variable statistics have been calculated, 6 of which appear on the first screen. Press R one or more
times to reveal additional statistics:
These statistics have each been stored inside the fx-991EX as variables, in case you should wish to use them in
further calculations.
Press C to return to the data entry screen.
Enter the Option menu by pressing i.
Select item 4(Statistics Calc) to enter the Statistics
calculation area.
Press i, and then the down arrow (R) once to reveal the
different categories of statistical variables.
For instance, to calculate the interquartile range (IQR), press
)-iR3(Min/Max)2(Q )p.
3(Min/Max)4(Q
3 1
fx-991EX Quick Start Guide 21